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Finding the Fourth Proportional to 408,639.20, 612,958.79 and 113,151.20

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Solution

The fourth proportional to 408,639.20, 612,958.79 and 113,151.20 is: 169,726.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,639.20 : 612,958.79 = 113,151.20 : x
  2. Step 2: Convert to fraction form
    408,639.20/612,958.79 = 113,151.20/x
  3. Step 3: Cross multiply
    408,639.20x = 612,958.79 × 113,151.20
  4. Step 4: Simplify right side
    408,639.20x = 69,357,019,008.50
  5. Step 5: Solve for x
    x = 69,357,019,008.50/408,639.20
  6. Step 6: Final answer
    x = 169,726.79

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Similar ratio
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1.5x scale

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.