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Finding the Fourth Proportional to 939.50, 1,296.56 and 519.92

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Solution

The fourth proportional to 939.50, 1,296.56 and 519.92 is: 717.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.50 : 1,296.56 = 519.92 : x
  2. Step 2: Convert to fraction form
    939.50/1,296.56 = 519.92/x
  3. Step 3: Cross multiply
    939.50x = 1,296.56 × 519.92
  4. Step 4: Simplify right side
    939.50x = 674,107.48
  5. Step 5: Solve for x
    x = 674,107.48/939.50
  6. Step 6: Final answer
    x = 717.52

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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.