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Finding the Fourth Proportional to 91,247.30, 136,640.55 and 72,815.30

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Solution

The fourth proportional to 91,247.30, 136,640.55 and 72,815.30 is: 109,039.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,247.30 : 136,640.55 = 72,815.30 : x
  2. Step 2: Convert to fraction form
    91,247.30/136,640.55 = 72,815.30/x
  3. Step 3: Cross multiply
    91,247.30x = 136,640.55 × 72,815.30
  4. Step 4: Simplify right side
    91,247.30x = 9,949,522,640.42
  5. Step 5: Solve for x
    x = 9,949,522,640.42/91,247.30
  6. Step 6: Final answer
    x = 109,039.09

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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.