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Finding the Fourth Proportional to 90,764.75, 136,369.58 and 85,729.19

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Solution

The fourth proportional to 90,764.75, 136,369.58 and 85,729.19 is: 128,803.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,764.75 : 136,369.58 = 85,729.19 : x
  2. Step 2: Convert to fraction form
    90,764.75/136,369.58 = 85,729.19/x
  3. Step 3: Cross multiply
    90,764.75x = 136,369.58 × 85,729.19
  4. Step 4: Simplify right side
    90,764.75x = 11,690,852,523.55
  5. Step 5: Solve for x
    x = 11,690,852,523.55/90,764.75
  6. Step 6: Final answer
    x = 128,803.88

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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.