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Finding the Fourth Proportional to 85,093.20, 127,639.80 and 71,269.20

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Solution

The fourth proportional to 85,093.20, 127,639.80 and 71,269.20 is: 106,903.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,093.20 : 127,639.80 = 71,269.20 : x
  2. Step 2: Convert to fraction form
    85,093.20/127,639.80 = 71,269.20/x
  3. Step 3: Cross multiply
    85,093.20x = 127,639.80 × 71,269.20
  4. Step 4: Simplify right side
    85,093.20x = 9,096,786,434.16
  5. Step 5: Solve for x
    x = 9,096,786,434.16/85,093.20
  6. Step 6: Final answer
    x = 106,903.80

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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.