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Finding the Fourth Proportional to 485,429.80, 728,144.70 and 308,720.20

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Solution

The fourth proportional to 485,429.80, 728,144.70 and 308,720.20 is: 463,080.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,429.80 : 728,144.70 = 308,720.20 : x
  2. Step 2: Convert to fraction form
    485,429.80/728,144.70 = 308,720.20/x
  3. Step 3: Cross multiply
    485,429.80x = 728,144.70 × 308,720.20
  4. Step 4: Simplify right side
    485,429.80x = 224,792,977,412.94
  5. Step 5: Solve for x
    x = 224,792,977,412.94/485,429.80
  6. Step 6: Final answer
    x = 463,080.30

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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.