Home / 128,531.80-177,371.94-71,945.20

Finding the Fourth Proportional to 128,531.80, 177,371.94 and 71,945.20

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Solution

The fourth proportional to 128,531.80, 177,371.94 and 71,945.20 is: 99,283.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,531.80 : 177,371.94 = 71,945.20 : x
  2. Step 2: Convert to fraction form
    128,531.80/177,371.94 = 71,945.20/x
  3. Step 3: Cross multiply
    128,531.80x = 177,371.94 × 71,945.20
  4. Step 4: Simplify right side
    128,531.80x = 12,761,059,697.69
  5. Step 5: Solve for x
    x = 12,761,059,697.69/128,531.80
  6. Step 6: Final answer
    x = 99,283.29

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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.