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Finding the Fourth Proportional to 408,278.80, 612,437.40 and 127,805.20

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Solution

The fourth proportional to 408,278.80, 612,437.40 and 127,805.20 is: 191,713.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,278.80 : 612,437.40 = 127,805.20 : x
  2. Step 2: Convert to fraction form
    408,278.80/612,437.40 = 127,805.20/x
  3. Step 3: Cross multiply
    408,278.80x = 612,437.40 × 127,805.20
  4. Step 4: Simplify right side
    408,278.80x = 78,272,684,394.48
  5. Step 5: Solve for x
    x = 78,272,684,394.48/408,278.80
  6. Step 6: Final answer
    x = 191,713.81

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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.