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Finding the Fourth Proportional to 91,207.20, 136,551.60 and 80,839.20

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Solution

The fourth proportional to 91,207.20, 136,551.60 and 80,839.20 is: 121,029.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,207.20 : 136,551.60 = 80,839.20 : x
  2. Step 2: Convert to fraction form
    91,207.20/136,551.60 = 80,839.20/x
  3. Step 3: Cross multiply
    91,207.20x = 136,551.60 × 80,839.20
  4. Step 4: Simplify right side
    91,207.20x = 11,038,722,102.72
  5. Step 5: Solve for x
    x = 11,038,722,102.72/91,207.20
  6. Step 6: Final answer
    x = 121,029.06

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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.