Home / 128,418.38-177,217.56-71,829.76

Finding the Fourth Proportional to 128,418.38, 177,217.56 and 71,829.76

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Solution

The fourth proportional to 128,418.38, 177,217.56 and 71,829.76 is: 99,125.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,418.38 : 177,217.56 = 71,829.76 : x
  2. Step 2: Convert to fraction form
    128,418.38/177,217.56 = 71,829.76/x
  3. Step 3: Cross multiply
    128,418.38x = 177,217.56 × 71,829.76
  4. Step 4: Simplify right side
    128,418.38x = 12,729,494,802.59
  5. Step 5: Solve for x
    x = 12,729,494,802.59/128,418.38
  6. Step 6: Final answer
    x = 99,125.18

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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.