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Finding the Fourth Proportional to 485,318.70, 728,306.10 and 218,942.10

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Solution

The fourth proportional to 485,318.70, 728,306.10 and 218,942.10 is: 328,561.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,318.70 : 728,306.10 = 218,942.10 : x
  2. Step 2: Convert to fraction form
    485,318.70/728,306.10 = 218,942.10/x
  3. Step 3: Cross multiply
    485,318.70x = 728,306.10 × 218,942.10
  4. Step 4: Simplify right side
    485,318.70x = 159,456,866,976.81
  5. Step 5: Solve for x
    x = 159,456,866,976.81/485,318.70
  6. Step 6: Final answer
    x = 328,561.14

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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.