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Finding the Fourth Proportional to 643,183.65, 963,489.21 and 386,874.66

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Solution

The fourth proportional to 643,183.65, 963,489.21 and 386,874.66 is: 579,538.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,183.65 : 963,489.21 = 386,874.66 : x
  2. Step 2: Convert to fraction form
    643,183.65/963,489.21 = 386,874.66/x
  3. Step 3: Cross multiply
    643,183.65x = 963,489.21 × 386,874.66
  4. Step 4: Simplify right side
    643,183.65x = 372,749,560,532.42
  5. Step 5: Solve for x
    x = 372,749,560,532.42/643,183.65
  6. Step 6: Final answer
    x = 579,538.30

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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.