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Finding the Fourth Proportional to 128,248.13, 176,982.42 and 71,659.50

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Solution

The fourth proportional to 128,248.13, 176,982.42 and 71,659.50 is: 98,890.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,248.13 : 176,982.42 = 71,659.50 : x
  2. Step 2: Convert to fraction form
    128,248.13/176,982.42 = 71,659.50/x
  3. Step 3: Cross multiply
    128,248.13x = 176,982.42 × 71,659.50
  4. Step 4: Simplify right side
    128,248.13x = 12,682,471,725.99
  5. Step 5: Solve for x
    x = 12,682,471,725.99/128,248.13
  6. Step 6: Final answer
    x = 98,890.11

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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.