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Finding the Fourth Proportional to 81,439.52, 112,391.52 and 45,631.76

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Solution

The fourth proportional to 81,439.52, 112,391.52 and 45,631.76 is: 62,974.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,439.52 : 112,391.52 = 45,631.76 : x
  2. Step 2: Convert to fraction form
    81,439.52/112,391.52 = 45,631.76/x
  3. Step 3: Cross multiply
    81,439.52x = 112,391.52 × 45,631.76
  4. Step 4: Simplify right side
    81,439.52x = 5,128,622,866.68
  5. Step 5: Solve for x
    x = 5,128,622,866.68/81,439.52
  6. Step 6: Final answer
    x = 62,974.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.