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Finding the Fourth Proportional to 91,387.60, 136,812.60 and 68,117.20

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Solution

The fourth proportional to 91,387.60, 136,812.60 and 68,117.20 is: 101,975.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,387.60 : 136,812.60 = 68,117.20 : x
  2. Step 2: Convert to fraction form
    91,387.60/136,812.60 = 68,117.20/x
  3. Step 3: Cross multiply
    91,387.60x = 136,812.60 × 68,117.20
  4. Step 4: Simplify right side
    91,387.60x = 9,319,291,236.72
  5. Step 5: Solve for x
    x = 9,319,291,236.72/91,387.60
  6. Step 6: Final answer
    x = 101,975.45

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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.