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Finding the Fourth Proportional to 100,348.70, 138,481.11 and 55,027.40

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Solution

The fourth proportional to 100,348.70, 138,481.11 and 55,027.40 is: 75,937.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,348.70 : 138,481.11 = 55,027.40 : x
  2. Step 2: Convert to fraction form
    100,348.70/138,481.11 = 55,027.40/x
  3. Step 3: Cross multiply
    100,348.70x = 138,481.11 × 55,027.40
  4. Step 4: Simplify right side
    100,348.70x = 7,620,254,740.01
  5. Step 5: Solve for x
    x = 7,620,254,740.01/100,348.70
  6. Step 6: Final answer
    x = 75,937.76

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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.