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Finding the Fourth Proportional to 408,468.80, 612,622.28 and 388,215.20

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Solution

The fourth proportional to 408,468.80, 612,622.28 and 388,215.20 is: 582,245.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,468.80 : 612,622.28 = 388,215.20 : x
  2. Step 2: Convert to fraction form
    408,468.80/612,622.28 = 388,215.20/x
  3. Step 3: Cross multiply
    408,468.80x = 612,622.28 × 388,215.20
  4. Step 4: Simplify right side
    408,468.80x = 237,829,280,954.66
  5. Step 5: Solve for x
    x = 237,829,280,954.66/408,468.80
  6. Step 6: Final answer
    x = 582,245.89

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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.