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Finding the Fourth Proportional to 100,366.32, 138,507.29 and 55,043.90

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Solution

The fourth proportional to 100,366.32, 138,507.29 and 55,043.90 is: 75,961.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,366.32 : 138,507.29 = 55,043.90 : x
  2. Step 2: Convert to fraction form
    100,366.32/138,507.29 = 55,043.90/x
  3. Step 3: Cross multiply
    100,366.32x = 138,507.29 × 55,043.90
  4. Step 4: Simplify right side
    100,366.32x = 7,623,981,420.03
  5. Step 5: Solve for x
    x = 7,623,981,420.03/100,366.32
  6. Step 6: Final answer
    x = 75,961.55

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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.