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Finding the Fourth Proportional to 128,737.52, 177,657.71 and 71,376.69

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Solution

The fourth proportional to 128,737.52, 177,657.71 and 71,376.69 is: 98,499.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,737.52 : 177,657.71 = 71,376.69 : x
  2. Step 2: Convert to fraction form
    128,737.52/177,657.71 = 71,376.69/x
  3. Step 3: Cross multiply
    128,737.52x = 177,657.71 × 71,376.69
  4. Step 4: Simplify right side
    128,737.52x = 12,680,619,292.78
  5. Step 5: Solve for x
    x = 12,680,619,292.78/128,737.52
  6. Step 6: Final answer
    x = 98,499.79

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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.