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Finding the Fourth Proportional to 91,812.40, 137,718.60 and 75,409.90

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Solution

The fourth proportional to 91,812.40, 137,718.60 and 75,409.90 is: 113,114.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,812.40 : 137,718.60 = 75,409.90 : x
  2. Step 2: Convert to fraction form
    91,812.40/137,718.60 = 75,409.90/x
  3. Step 3: Cross multiply
    91,812.40x = 137,718.60 × 75,409.90
  4. Step 4: Simplify right side
    91,812.40x = 10,385,345,854.14
  5. Step 5: Solve for x
    x = 10,385,345,854.14/91,812.40
  6. Step 6: Final answer
    x = 113,114.85

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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.