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Finding the Fourth Proportional to 100,279.62, 138,380.40 and 54,956.88

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Solution

The fourth proportional to 100,279.62, 138,380.40 and 54,956.88 is: 75,837.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,279.62 : 138,380.40 = 54,956.88 : x
  2. Step 2: Convert to fraction form
    100,279.62/138,380.40 = 54,956.88/x
  3. Step 3: Cross multiply
    100,279.62x = 138,380.40 × 54,956.88
  4. Step 4: Simplify right side
    100,279.62x = 7,604,955,037.15
  5. Step 5: Solve for x
    x = 7,604,955,037.15/100,279.62
  6. Step 6: Final answer
    x = 75,837.49

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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.