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Finding the Fourth Proportional to 91,129.20, 136,693.80 and 85,224.30

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Solution

The fourth proportional to 91,129.20, 136,693.80 and 85,224.30 is: 127,836.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,129.20 : 136,693.80 = 85,224.30 : x
  2. Step 2: Convert to fraction form
    91,129.20/136,693.80 = 85,224.30/x
  3. Step 3: Cross multiply
    91,129.20x = 136,693.80 × 85,224.30
  4. Step 4: Simplify right side
    91,129.20x = 11,649,633,419.34
  5. Step 5: Solve for x
    x = 11,649,633,419.34/91,129.20
  6. Step 6: Final answer
    x = 127,836.45

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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.