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Finding the Fourth Proportional to 100,170.08, 138,229.40 and 54,839.40

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Solution

The fourth proportional to 100,170.08, 138,229.40 and 54,839.40 is: 75,675.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,170.08 : 138,229.40 = 54,839.40 : x
  2. Step 2: Convert to fraction form
    100,170.08/138,229.40 = 54,839.40/x
  3. Step 3: Cross multiply
    100,170.08x = 138,229.40 × 54,839.40
  4. Step 4: Simplify right side
    100,170.08x = 7,580,417,358.36
  5. Step 5: Solve for x
    x = 7,580,417,358.36/100,170.08
  6. Step 6: Final answer
    x = 75,675.46

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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.