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Finding the Fourth Proportional to 408,549.88, 612,923.19 and 128,067.13

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Solution

The fourth proportional to 408,549.88, 612,923.19 and 128,067.13 is: 192,131.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,549.88 : 612,923.19 = 128,067.13 : x
  2. Step 2: Convert to fraction form
    408,549.88/612,923.19 = 128,067.13/x
  3. Step 3: Cross multiply
    408,549.88x = 612,923.19 × 128,067.13
  4. Step 4: Simplify right side
    408,549.88x = 78,495,313,853.74
  5. Step 5: Solve for x
    x = 78,495,313,853.74/408,549.88
  6. Step 6: Final answer
    x = 192,131.53

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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.