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Finding the Fourth Proportional to 128,722.92, 177,648.12 and 71,380.22

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Solution

The fourth proportional to 128,722.92, 177,648.12 and 71,380.22 is: 98,510.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,722.92 : 177,648.12 = 71,380.22 : x
  2. Step 2: Convert to fraction form
    128,722.92/177,648.12 = 71,380.22/x
  3. Step 3: Cross multiply
    128,722.92x = 177,648.12 × 71,380.22
  4. Step 4: Simplify right side
    128,722.92x = 12,680,560,999.95
  5. Step 5: Solve for x
    x = 12,680,560,999.95/128,722.92
  6. Step 6: Final answer
    x = 98,510.52

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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.