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Finding the Fourth Proportional to 128,793.86, 177,729.18 and 71,428.68

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Solution

The fourth proportional to 128,793.86, 177,729.18 and 71,428.68 is: 98,568.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,793.86 : 177,729.18 = 71,428.68 : x
  2. Step 2: Convert to fraction form
    128,793.86/177,729.18 = 71,428.68/x
  3. Step 3: Cross multiply
    128,793.86x = 177,729.18 × 71,428.68
  4. Step 4: Simplify right side
    128,793.86x = 12,694,960,724.88
  5. Step 5: Solve for x
    x = 12,694,960,724.88/128,793.86
  6. Step 6: Final answer
    x = 98,568.06

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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.