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Finding the Fourth Proportional to 100,281.60, 138,389.70 and 54,958.61

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Solution

The fourth proportional to 100,281.60, 138,389.70 and 54,958.61 is: 75,843.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,281.60 : 138,389.70 = 54,958.61 : x
  2. Step 2: Convert to fraction form
    100,281.60/138,389.70 = 54,958.61/x
  3. Step 3: Cross multiply
    100,281.60x = 138,389.70 × 54,958.61
  4. Step 4: Simplify right side
    100,281.60x = 7,605,704,996.18
  5. Step 5: Solve for x
    x = 7,605,704,996.18/100,281.60
  6. Step 6: Final answer
    x = 75,843.47

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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.