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Finding the Fourth Proportional to 278,481.60, 417,722.40 and 91,499.20

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Solution

The fourth proportional to 278,481.60, 417,722.40 and 91,499.20 is: 137,248.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,481.60 : 417,722.40 = 91,499.20 : x
  2. Step 2: Convert to fraction form
    278,481.60/417,722.40 = 91,499.20/x
  3. Step 3: Cross multiply
    278,481.60x = 417,722.40 × 91,499.20
  4. Step 4: Simplify right side
    278,481.60x = 38,221,265,422.08
  5. Step 5: Solve for x
    x = 38,221,265,422.08/278,481.60
  6. Step 6: Final answer
    x = 137,248.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.