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Finding the Fourth Proportional to 91,086.60, 136,629.90 and 85,211.40

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Solution

The fourth proportional to 91,086.60, 136,629.90 and 85,211.40 is: 127,817.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,086.60 : 136,629.90 = 85,211.40 : x
  2. Step 2: Convert to fraction form
    91,086.60/136,629.90 = 85,211.40/x
  3. Step 3: Cross multiply
    91,086.60x = 136,629.90 × 85,211.40
  4. Step 4: Simplify right side
    91,086.60x = 11,642,425,060.86
  5. Step 5: Solve for x
    x = 11,642,425,060.86/91,086.60
  6. Step 6: Final answer
    x = 127,817.10

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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.