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Finding the Fourth Proportional to 1,306.22, 1,959.78 and 818.69

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Solution

The fourth proportional to 1,306.22, 1,959.78 and 818.69 is: 1,228.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,306.22 : 1,959.78 = 818.69 : x
  2. Step 2: Convert to fraction form
    1,306.22/1,959.78 = 818.69/x
  3. Step 3: Cross multiply
    1,306.22x = 1,959.78 × 818.69
  4. Step 4: Simplify right side
    1,306.22x = 1,604,452.29
  5. Step 5: Solve for x
    x = 1,604,452.29/1,306.22
  6. Step 6: Final answer
    x = 1,228.32

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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.