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Finding the Fourth Proportional to 717.47, 989.99 and 402.72

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Solution

The fourth proportional to 717.47, 989.99 and 402.72 is: 555.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.47 : 989.99 = 402.72 : x
  2. Step 2: Convert to fraction form
    717.47/989.99 = 402.72/x
  3. Step 3: Cross multiply
    717.47x = 989.99 × 402.72
  4. Step 4: Simplify right side
    717.47x = 398,686.76
  5. Step 5: Solve for x
    x = 398,686.76/717.47
  6. Step 6: Final answer
    x = 555.69

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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.