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Finding the Fourth Proportional to 128,632.59, 177,512.72 and 72,042.75

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Solution

The fourth proportional to 128,632.59, 177,512.72 and 72,042.75 is: 99,418.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,632.59 : 177,512.72 = 72,042.75 : x
  2. Step 2: Convert to fraction form
    128,632.59/177,512.72 = 72,042.75/x
  3. Step 3: Cross multiply
    128,632.59x = 177,512.72 × 72,042.75
  4. Step 4: Simplify right side
    128,632.59x = 12,788,504,148.57
  5. Step 5: Solve for x
    x = 12,788,504,148.57/128,632.59
  6. Step 6: Final answer
    x = 99,418.85

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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.