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Finding the Fourth Proportional to 66,691.20, 92,043.84 and 38,391.40

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Solution

The fourth proportional to 66,691.20, 92,043.84 and 38,391.40 is: 52,985.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,691.20 : 92,043.84 = 38,391.40 : x
  2. Step 2: Convert to fraction form
    66,691.20/92,043.84 = 38,391.40/x
  3. Step 3: Cross multiply
    66,691.20x = 92,043.84 × 38,391.40
  4. Step 4: Simplify right side
    66,691.20x = 3,533,691,878.98
  5. Step 5: Solve for x
    x = 3,533,691,878.98/66,691.20
  6. Step 6: Final answer
    x = 52,985.88

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1.5x scale

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.