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Finding the Fourth Proportional to 571.40, 788.56 and 347.40

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Solution

The fourth proportional to 571.40, 788.56 and 347.40 is: 479.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.40 : 788.56 = 347.40 : x
  2. Step 2: Convert to fraction form
    571.40/788.56 = 347.40/x
  3. Step 3: Cross multiply
    571.40x = 788.56 × 347.40
  4. Step 4: Simplify right side
    571.40x = 273,945.74
  5. Step 5: Solve for x
    x = 273,945.74/571.40
  6. Step 6: Final answer
    x = 479.43

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Double scale
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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.