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Finding the Fourth Proportional to 431,628.80, 647,443.20 and 392,921.60

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Solution

The fourth proportional to 431,628.80, 647,443.20 and 392,921.60 is: 589,382.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,628.80 : 647,443.20 = 392,921.60 : x
  2. Step 2: Convert to fraction form
    431,628.80/647,443.20 = 392,921.60/x
  3. Step 3: Cross multiply
    431,628.80x = 647,443.20 × 392,921.60
  4. Step 4: Simplify right side
    431,628.80x = 254,394,418,053.12
  5. Step 5: Solve for x
    x = 254,394,418,053.12/431,628.80
  6. Step 6: Final answer
    x = 589,382.40

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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.