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Finding the Fourth Proportional to 91,874.60, 137,811.90 and 71,138.60

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Solution

The fourth proportional to 91,874.60, 137,811.90 and 71,138.60 is: 106,707.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,874.60 : 137,811.90 = 71,138.60 : x
  2. Step 2: Convert to fraction form
    91,874.60/137,811.90 = 71,138.60/x
  3. Step 3: Cross multiply
    91,874.60x = 137,811.90 × 71,138.60
  4. Step 4: Simplify right side
    91,874.60x = 9,803,745,629.34
  5. Step 5: Solve for x
    x = 9,803,745,629.34/91,874.60
  6. Step 6: Final answer
    x = 106,707.90

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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.