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Finding the Fourth Proportional to 638,841.40, 958,446.78 and 206,549.66

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Solution

The fourth proportional to 638,841.40, 958,446.78 and 206,549.66 is: 309,884.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,841.40 : 958,446.78 = 206,549.66 : x
  2. Step 2: Convert to fraction form
    638,841.40/958,446.78 = 206,549.66/x
  3. Step 3: Cross multiply
    638,841.40x = 958,446.78 × 206,549.66
  4. Step 4: Simplify right side
    638,841.40x = 197,966,858,158.65
  5. Step 5: Solve for x
    x = 197,966,858,158.65/638,841.40
  6. Step 6: Final answer
    x = 309,884.20

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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.