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Finding the Fourth Proportional to 1,286.38, 1,930.26 and 555.90

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Solution

The fourth proportional to 1,286.38, 1,930.26 and 555.90 is: 834.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.38 : 1,930.26 = 555.90 : x
  2. Step 2: Convert to fraction form
    1,286.38/1,930.26 = 555.90/x
  3. Step 3: Cross multiply
    1,286.38x = 1,930.26 × 555.90
  4. Step 4: Simplify right side
    1,286.38x = 1,073,031.53
  5. Step 5: Solve for x
    x = 1,073,031.53/1,286.38
  6. Step 6: Final answer
    x = 834.15

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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.