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Finding the Fourth Proportional to 939.50, 1,296.49 and 519.87

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Solution

The fourth proportional to 939.50, 1,296.49 and 519.87 is: 717.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.50 : 1,296.49 = 519.87 : x
  2. Step 2: Convert to fraction form
    939.50/1,296.49 = 519.87/x
  3. Step 3: Cross multiply
    939.50x = 1,296.49 × 519.87
  4. Step 4: Simplify right side
    939.50x = 674,006.26
  5. Step 5: Solve for x
    x = 674,006.26/939.50
  6. Step 6: Final answer
    x = 717.41

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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.