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Finding the Fourth Proportional to 386,067.20, 579,129.60 and 136,716.80

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Solution

The fourth proportional to 386,067.20, 579,129.60 and 136,716.80 is: 205,085.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,067.20 : 579,129.60 = 136,716.80 : x
  2. Step 2: Convert to fraction form
    386,067.20/579,129.60 = 136,716.80/x
  3. Step 3: Cross multiply
    386,067.20x = 579,129.60 × 136,716.80
  4. Step 4: Simplify right side
    386,067.20x = 79,176,745,697.28
  5. Step 5: Solve for x
    x = 79,176,745,697.28/386,067.20
  6. Step 6: Final answer
    x = 205,085.40

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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.