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Finding the Fourth Proportional to 128,711.84, 177,597 and 80,937.44

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Solution

The fourth proportional to 128,711.84, 177,597 and 80,937.44 is: 111,677.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,711.84 : 177,597 = 80,937.44 : x
  2. Step 2: Convert to fraction form
    128,711.84/177,597 = 80,937.44/x
  3. Step 3: Cross multiply
    128,711.84x = 177,597 × 80,937.44
  4. Step 4: Simplify right side
    128,711.84x = 14,374,246,531.68
  5. Step 5: Solve for x
    x = 14,374,246,531.68/128,711.84
  6. Step 6: Final answer
    x = 111,677.73

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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.