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Finding the Fourth Proportional to 571,118.40, 855,858.40 and 420,180.80

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Solution

The fourth proportional to 571,118.40, 855,858.40 and 420,180.80 is: 629,668.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    571,118.40 : 855,858.40 = 420,180.80 : x
  2. Step 2: Convert to fraction form
    571,118.40/855,858.40 = 420,180.80/x
  3. Step 3: Cross multiply
    571,118.40x = 855,858.40 × 420,180.80
  4. Step 4: Simplify right side
    571,118.40x = 359,615,267,198.72
  5. Step 5: Solve for x
    x = 359,615,267,198.72/571,118.40
  6. Step 6: Final answer
    x = 629,668.50

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.