Home / 128,732.10-177,649.92-72,143.46

Finding the Fourth Proportional to 128,732.10, 177,649.92 and 72,143.46

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Solution

The fourth proportional to 128,732.10, 177,649.92 and 72,143.46 is: 99,557.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,732.10 : 177,649.92 = 72,143.46 : x
  2. Step 2: Convert to fraction form
    128,732.10/177,649.92 = 72,143.46/x
  3. Step 3: Cross multiply
    128,732.10x = 177,649.92 × 72,143.46
  4. Step 4: Simplify right side
    128,732.10x = 12,816,279,897.52
  5. Step 5: Solve for x
    x = 12,816,279,897.52/128,732.10
  6. Step 6: Final answer
    x = 99,557.76

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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.