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Finding the Fourth Proportional to 408,916.80, 611,917.20 and 259,228.80

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Solution

The fourth proportional to 408,916.80, 611,917.20 and 259,228.80 is: 387,918.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,916.80 : 611,917.20 = 259,228.80 : x
  2. Step 2: Convert to fraction form
    408,916.80/611,917.20 = 259,228.80/x
  3. Step 3: Cross multiply
    408,916.80x = 611,917.20 × 259,228.80
  4. Step 4: Simplify right side
    408,916.80x = 158,626,561,455.36
  5. Step 5: Solve for x
    x = 158,626,561,455.36/408,916.80
  6. Step 6: Final answer
    x = 387,918.92

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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.