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Finding the Fourth Proportional to 485,616.80, 728,425.20 and 308,907.20

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Solution

The fourth proportional to 485,616.80, 728,425.20 and 308,907.20 is: 463,360.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,616.80 : 728,425.20 = 308,907.20 : x
  2. Step 2: Convert to fraction form
    485,616.80/728,425.20 = 308,907.20/x
  3. Step 3: Cross multiply
    485,616.80x = 728,425.20 × 308,907.20
  4. Step 4: Simplify right side
    485,616.80x = 225,015,788,941.44
  5. Step 5: Solve for x
    x = 225,015,788,941.44/485,616.80
  6. Step 6: Final answer
    x = 463,360.80

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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.