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Finding the Fourth Proportional to 128,876.84, 177,851.40 and 72,287

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Solution

The fourth proportional to 128,876.84, 177,851.40 and 72,287 is: 99,756.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,876.84 : 177,851.40 = 72,287 : x
  2. Step 2: Convert to fraction form
    128,876.84/177,851.40 = 72,287/x
  3. Step 3: Cross multiply
    128,876.84x = 177,851.40 × 72,287
  4. Step 4: Simplify right side
    128,876.84x = 12,856,344,151.80
  5. Step 5: Solve for x
    x = 12,856,344,151.80/128,876.84
  6. Step 6: Final answer
    x = 99,756.82

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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.