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Finding the Fourth Proportional to 717.18, 989.71 and 402.45

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Solution

The fourth proportional to 717.18, 989.71 and 402.45 is: 555.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.18 : 989.71 = 402.45 : x
  2. Step 2: Convert to fraction form
    717.18/989.71 = 402.45/x
  3. Step 3: Cross multiply
    717.18x = 989.71 × 402.45
  4. Step 4: Simplify right side
    717.18x = 398,309.53
  5. Step 5: Solve for x
    x = 398,309.53/717.18
  6. Step 6: Final answer
    x = 555.38

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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.