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Finding the Fourth Proportional to 485,605.10, 728,617.80 and 260,703.20

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Solution

The fourth proportional to 485,605.10, 728,617.80 and 260,703.20 is: 391,167.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,605.10 : 728,617.80 = 260,703.20 : x
  2. Step 2: Convert to fraction form
    485,605.10/728,617.80 = 260,703.20/x
  3. Step 3: Cross multiply
    485,605.10x = 728,617.80 × 260,703.20
  4. Step 4: Simplify right side
    485,605.10x = 189,952,992,036.96
  5. Step 5: Solve for x
    x = 189,952,992,036.96/485,605.10
  6. Step 6: Final answer
    x = 391,167.62

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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.