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Finding the Fourth Proportional to 717.04, 1,073.36 and 391.60

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Solution

The fourth proportional to 717.04, 1,073.36 and 391.60 is: 586.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.04 : 1,073.36 = 391.60 : x
  2. Step 2: Convert to fraction form
    717.04/1,073.36 = 391.60/x
  3. Step 3: Cross multiply
    717.04x = 1,073.36 × 391.60
  4. Step 4: Simplify right side
    717.04x = 420,327.78
  5. Step 5: Solve for x
    x = 420,327.78/717.04
  6. Step 6: Final answer
    x = 586.20

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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.