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Finding the Fourth Proportional to 717.78, 1,076.66 and 614.90

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Solution

The fourth proportional to 717.78, 1,076.66 and 614.90 is: 922.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.78 : 1,076.66 = 614.90 : x
  2. Step 2: Convert to fraction form
    717.78/1,076.66 = 614.90/x
  3. Step 3: Cross multiply
    717.78x = 1,076.66 × 614.90
  4. Step 4: Simplify right side
    717.78x = 662,038.23
  5. Step 5: Solve for x
    x = 662,038.23/717.78
  6. Step 6: Final answer
    x = 922.34

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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.