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Finding the Fourth Proportional to 57,936, 79,951.68 and 31,440

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Solution

The fourth proportional to 57,936, 79,951.68 and 31,440 is: 43,387.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,936 : 79,951.68 = 31,440 : x
  2. Step 2: Convert to fraction form
    57,936/79,951.68 = 31,440/x
  3. Step 3: Cross multiply
    57,936x = 79,951.68 × 31,440
  4. Step 4: Simplify right side
    57,936x = 2,513,680,819.20
  5. Step 5: Solve for x
    x = 2,513,680,819.20/57,936
  6. Step 6: Final answer
    x = 43,387.20

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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.