Home / 100,447.38-138,617.64-55,125.72

Finding the Fourth Proportional to 100,447.38, 138,617.64 and 55,125.72

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Solution

The fourth proportional to 100,447.38, 138,617.64 and 55,125.72 is: 76,073.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,447.38 : 138,617.64 = 55,125.72 : x
  2. Step 2: Convert to fraction form
    100,447.38/138,617.64 = 55,125.72/x
  3. Step 3: Cross multiply
    100,447.38x = 138,617.64 × 55,125.72
  4. Step 4: Simplify right side
    100,447.38x = 7,641,397,209.70
  5. Step 5: Solve for x
    x = 7,641,397,209.70/100,447.38
  6. Step 6: Final answer
    x = 76,073.63

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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.