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Finding the Fourth Proportional to 717.18, 988.80 and 517.92

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Solution

The fourth proportional to 717.18, 988.80 and 517.92 is: 714.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.18 : 988.80 = 517.92 : x
  2. Step 2: Convert to fraction form
    717.18/988.80 = 517.92/x
  3. Step 3: Cross multiply
    717.18x = 988.80 × 517.92
  4. Step 4: Simplify right side
    717.18x = 512,119.30
  5. Step 5: Solve for x
    x = 512,119.30/717.18
  6. Step 6: Final answer
    x = 714.07

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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.