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Finding the Fourth Proportional to 717.60, 990.96 and 571.30

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Solution

The fourth proportional to 717.60, 990.96 and 571.30 is: 788.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.60 : 990.96 = 571.30 : x
  2. Step 2: Convert to fraction form
    717.60/990.96 = 571.30/x
  3. Step 3: Cross multiply
    717.60x = 990.96 × 571.30
  4. Step 4: Simplify right side
    717.60x = 566,132.97
  5. Step 5: Solve for x
    x = 566,132.97/717.60
  6. Step 6: Final answer
    x = 788.93

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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.