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Finding the Fourth Proportional to 1,255.55, 1,882.17 and 638.91

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Solution

The fourth proportional to 1,255.55, 1,882.17 and 638.91 is: 957.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,255.55 : 1,882.17 = 638.91 : x
  2. Step 2: Convert to fraction form
    1,255.55/1,882.17 = 638.91/x
  3. Step 3: Cross multiply
    1,255.55x = 1,882.17 × 638.91
  4. Step 4: Simplify right side
    1,255.55x = 1,202,537.23
  5. Step 5: Solve for x
    x = 1,202,537.23/1,255.55
  6. Step 6: Final answer
    x = 957.78

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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.