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Finding the Fourth Proportional to 92,115.40, 137,978.70 and 72,286.60

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Solution

The fourth proportional to 92,115.40, 137,978.70 and 72,286.60 is: 108,277.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,115.40 : 137,978.70 = 72,286.60 : x
  2. Step 2: Convert to fraction form
    92,115.40/137,978.70 = 72,286.60/x
  3. Step 3: Cross multiply
    92,115.40x = 137,978.70 × 72,286.60
  4. Step 4: Simplify right side
    92,115.40x = 9,974,011,095.42
  5. Step 5: Solve for x
    x = 9,974,011,095.42/92,115.40
  6. Step 6: Final answer
    x = 108,277.35

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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.