Home / 129,387.50-178,370.25-100,656.69

Finding the Fourth Proportional to 129,387.50, 178,370.25 and 100,656.69

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Solution

The fourth proportional to 129,387.50, 178,370.25 and 100,656.69 is: 138,762.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,387.50 : 178,370.25 = 100,656.69 : x
  2. Step 2: Convert to fraction form
    129,387.50/178,370.25 = 100,656.69/x
  3. Step 3: Cross multiply
    129,387.50x = 178,370.25 × 100,656.69
  4. Step 4: Simplify right side
    129,387.50x = 17,954,158,959.47
  5. Step 5: Solve for x
    x = 17,954,158,959.47/129,387.50
  6. Step 6: Final answer
    x = 138,762.71

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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.