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Finding the Fourth Proportional to 67,814.60, 101,721.90 and 42,931.40

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Solution

The fourth proportional to 67,814.60, 101,721.90 and 42,931.40 is: 64,397.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,814.60 : 101,721.90 = 42,931.40 : x
  2. Step 2: Convert to fraction form
    67,814.60/101,721.90 = 42,931.40/x
  3. Step 3: Cross multiply
    67,814.60x = 101,721.90 × 42,931.40
  4. Step 4: Simplify right side
    67,814.60x = 4,367,063,577.66
  5. Step 5: Solve for x
    x = 4,367,063,577.66/67,814.60
  6. Step 6: Final answer
    x = 64,397.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.