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Finding the Fourth Proportional to 91,141.20, 136,711.80 and 85,600.80

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Solution

The fourth proportional to 91,141.20, 136,711.80 and 85,600.80 is: 128,401.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,141.20 : 136,711.80 = 85,600.80 : x
  2. Step 2: Convert to fraction form
    91,141.20/136,711.80 = 85,600.80/x
  3. Step 3: Cross multiply
    91,141.20x = 136,711.80 × 85,600.80
  4. Step 4: Simplify right side
    91,141.20x = 11,702,639,449.44
  5. Step 5: Solve for x
    x = 11,702,639,449.44/91,141.20
  6. Step 6: Final answer
    x = 128,401.20

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1.5x scale

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.