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Finding the Fourth Proportional to 485,617.20, 728,207.10 and 219,240.60

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Solution

The fourth proportional to 485,617.20, 728,207.10 and 219,240.60 is: 328,762.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,617.20 : 728,207.10 = 219,240.60 : x
  2. Step 2: Convert to fraction form
    485,617.20/728,207.10 = 219,240.60/x
  3. Step 3: Cross multiply
    485,617.20x = 728,207.10 × 219,240.60
  4. Step 4: Simplify right side
    485,617.20x = 159,652,561,528.26
  5. Step 5: Solve for x
    x = 159,652,561,528.26/485,617.20
  6. Step 6: Final answer
    x = 328,762.16

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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.