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Finding the Fourth Proportional to 100,548.20, 138,758.20 and 55,230.39

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Solution

The fourth proportional to 100,548.20, 138,758.20 and 55,230.39 is: 76,218.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,548.20 : 138,758.20 = 55,230.39 : x
  2. Step 2: Convert to fraction form
    100,548.20/138,758.20 = 55,230.39/x
  3. Step 3: Cross multiply
    100,548.20x = 138,758.20 × 55,230.39
  4. Step 4: Simplify right side
    100,548.20x = 7,663,669,363.62
  5. Step 5: Solve for x
    x = 7,663,669,363.62/100,548.20
  6. Step 6: Final answer
    x = 76,218.86

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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.