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Finding the Fourth Proportional to 939.80, 1,296.91 and 520.22

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Solution

The fourth proportional to 939.80, 1,296.91 and 520.22 is: 717.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.80 : 1,296.91 = 520.22 : x
  2. Step 2: Convert to fraction form
    939.80/1,296.91 = 520.22/x
  3. Step 3: Cross multiply
    939.80x = 1,296.91 × 520.22
  4. Step 4: Simplify right side
    939.80x = 674,678.52
  5. Step 5: Solve for x
    x = 674,678.52/939.80
  6. Step 6: Final answer
    x = 717.90

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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.