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Finding the Fourth Proportional to 619.99, 855.55 and 340.18

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Solution

The fourth proportional to 619.99, 855.55 and 340.18 is: 469.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.99 : 855.55 = 340.18 : x
  2. Step 2: Convert to fraction form
    619.99/855.55 = 340.18/x
  3. Step 3: Cross multiply
    619.99x = 855.55 × 340.18
  4. Step 4: Simplify right side
    619.99x = 291,036.72
  5. Step 5: Solve for x
    x = 291,036.72/619.99
  6. Step 6: Final answer
    x = 469.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.