Home / 128,987.43-178,069.46-100,242.87

Finding the Fourth Proportional to 128,987.43, 178,069.46 and 100,242.87

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Solution

The fourth proportional to 128,987.43, 178,069.46 and 100,242.87 is: 138,387.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,987.43 : 178,069.46 = 100,242.87 : x
  2. Step 2: Convert to fraction form
    128,987.43/178,069.46 = 100,242.87/x
  3. Step 3: Cross multiply
    128,987.43x = 178,069.46 × 100,242.87
  4. Step 4: Simplify right side
    128,987.43x = 17,850,193,729.75
  5. Step 5: Solve for x
    x = 17,850,193,729.75/128,987.43
  6. Step 6: Final answer
    x = 138,387.08

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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.