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Finding the Fourth Proportional to 91,377.20, 137,065.80 and 87,440.60

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Solution

The fourth proportional to 91,377.20, 137,065.80 and 87,440.60 is: 131,160.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,377.20 : 137,065.80 = 87,440.60 : x
  2. Step 2: Convert to fraction form
    91,377.20/137,065.80 = 87,440.60/x
  3. Step 3: Cross multiply
    91,377.20x = 137,065.80 × 87,440.60
  4. Step 4: Simplify right side
    91,377.20x = 11,985,115,791.48
  5. Step 5: Solve for x
    x = 11,985,115,791.48/91,377.20
  6. Step 6: Final answer
    x = 131,160.90

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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.