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Finding the Fourth Proportional to 1,306.25, 1,959.33 and 381.83

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Solution

The fourth proportional to 1,306.25, 1,959.33 and 381.83 is: 572.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,306.25 : 1,959.33 = 381.83 : x
  2. Step 2: Convert to fraction form
    1,306.25/1,959.33 = 381.83/x
  3. Step 3: Cross multiply
    1,306.25x = 1,959.33 × 381.83
  4. Step 4: Simplify right side
    1,306.25x = 748,121.18
  5. Step 5: Solve for x
    x = 748,121.18/1,306.25
  6. Step 6: Final answer
    x = 572.73

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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.