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Finding the Fourth Proportional to 100,155.39, 138,216.07 and 54,832.61

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Solution

The fourth proportional to 100,155.39, 138,216.07 and 54,832.61 is: 75,669.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,155.39 : 138,216.07 = 54,832.61 : x
  2. Step 2: Convert to fraction form
    100,155.39/138,216.07 = 54,832.61/x
  3. Step 3: Cross multiply
    100,155.39x = 138,216.07 × 54,832.61
  4. Step 4: Simplify right side
    100,155.39x = 7,578,747,862.04
  5. Step 5: Solve for x
    x = 7,578,747,862.04/100,155.39
  6. Step 6: Final answer
    x = 75,669.90

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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.