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Finding the Fourth Proportional to 408,025.90, 611,878.56 and 138,079.69

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Solution

The fourth proportional to 408,025.90, 611,878.56 and 138,079.69 is: 207,065.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,025.90 : 611,878.56 = 138,079.69 : x
  2. Step 2: Convert to fraction form
    408,025.90/611,878.56 = 138,079.69/x
  3. Step 3: Cross multiply
    408,025.90x = 611,878.56 × 138,079.69
  4. Step 4: Simplify right side
    408,025.90x = 84,488,001,882.45
  5. Step 5: Solve for x
    x = 84,488,001,882.45/408,025.90
  6. Step 6: Final answer
    x = 207,065.29

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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.