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Finding the Fourth Proportional to 939.92, 1,296.72 and 625.32

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Solution

The fourth proportional to 939.92, 1,296.72 and 625.32 is: 862.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.92 : 1,296.72 = 625.32 : x
  2. Step 2: Convert to fraction form
    939.92/1,296.72 = 625.32/x
  3. Step 3: Cross multiply
    939.92x = 1,296.72 × 625.32
  4. Step 4: Simplify right side
    939.92x = 810,864.95
  5. Step 5: Solve for x
    x = 810,864.95/939.92
  6. Step 6: Final answer
    x = 862.70

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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.