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Finding the Fourth Proportional to 128,470.62, 177,294.39 and 71,880.78

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Solution

The fourth proportional to 128,470.62, 177,294.39 and 71,880.78 is: 99,198.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,470.62 : 177,294.39 = 71,880.78 : x
  2. Step 2: Convert to fraction form
    128,470.62/177,294.39 = 71,880.78/x
  3. Step 3: Cross multiply
    128,470.62x = 177,294.39 × 71,880.78
  4. Step 4: Simplify right side
    128,470.62x = 12,744,059,042.82
  5. Step 5: Solve for x
    x = 12,744,059,042.82/128,470.62
  6. Step 6: Final answer
    x = 99,198.24

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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.