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Finding the Fourth Proportional to 81,760.68, 112,790.34 and 71,133.48

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Solution

The fourth proportional to 81,760.68, 112,790.34 and 71,133.48 is: 98,129.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,760.68 : 112,790.34 = 71,133.48 : x
  2. Step 2: Convert to fraction form
    81,760.68/112,790.34 = 71,133.48/x
  3. Step 3: Cross multiply
    81,760.68x = 112,790.34 × 71,133.48
  4. Step 4: Simplify right side
    81,760.68x = 8,023,169,394.58
  5. Step 5: Solve for x
    x = 8,023,169,394.58/81,760.68
  6. Step 6: Final answer
    x = 98,129.92

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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.