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Finding the Fourth Proportional to 91,130.20, 136,695.30 and 85,225.30

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Solution

The fourth proportional to 91,130.20, 136,695.30 and 85,225.30 is: 127,837.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,130.20 : 136,695.30 = 85,225.30 : x
  2. Step 2: Convert to fraction form
    91,130.20/136,695.30 = 85,225.30/x
  3. Step 3: Cross multiply
    91,130.20x = 136,695.30 × 85,225.30
  4. Step 4: Simplify right side
    91,130.20x = 11,649,897,951.09
  5. Step 5: Solve for x
    x = 11,649,897,951.09/91,130.20
  6. Step 6: Final answer
    x = 127,837.95

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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.