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Finding the Fourth Proportional to 85,639.60, 128,564.70 and 54,049.60

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Solution

The fourth proportional to 85,639.60, 128,564.70 and 54,049.60 is: 81,140.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,639.60 : 128,564.70 = 54,049.60 : x
  2. Step 2: Convert to fraction form
    85,639.60/128,564.70 = 54,049.60/x
  3. Step 3: Cross multiply
    85,639.60x = 128,564.70 × 54,049.60
  4. Step 4: Simplify right side
    85,639.60x = 6,948,870,609.12
  5. Step 5: Solve for x
    x = 6,948,870,609.12/85,639.60
  6. Step 6: Final answer
    x = 81,140.86

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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.