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Finding the Fourth Proportional to 91,425.80, 137,138.70 and 56,251.40

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Solution

The fourth proportional to 91,425.80, 137,138.70 and 56,251.40 is: 84,377.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,425.80 : 137,138.70 = 56,251.40 : x
  2. Step 2: Convert to fraction form
    91,425.80/137,138.70 = 56,251.40/x
  3. Step 3: Cross multiply
    91,425.80x = 137,138.70 × 56,251.40
  4. Step 4: Simplify right side
    91,425.80x = 7,714,243,869.18
  5. Step 5: Solve for x
    x = 7,714,243,869.18/91,425.80
  6. Step 6: Final answer
    x = 84,377.10

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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.