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Finding the Fourth Proportional to 85,861.20, 128,791.80 and 81,022.80

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Solution

The fourth proportional to 85,861.20, 128,791.80 and 81,022.80 is: 121,534.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,861.20 : 128,791.80 = 81,022.80 : x
  2. Step 2: Convert to fraction form
    85,861.20/128,791.80 = 81,022.80/x
  3. Step 3: Cross multiply
    85,861.20x = 128,791.80 × 81,022.80
  4. Step 4: Simplify right side
    85,861.20x = 10,435,072,253.04
  5. Step 5: Solve for x
    x = 10,435,072,253.04/85,861.20
  6. Step 6: Final answer
    x = 121,534.20

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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.