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Finding the Fourth Proportional to 1,512.78, 2,269.72 and 691.13

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Solution

The fourth proportional to 1,512.78, 2,269.72 and 691.13 is: 1,036.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,512.78 : 2,269.72 = 691.13 : x
  2. Step 2: Convert to fraction form
    1,512.78/2,269.72 = 691.13/x
  3. Step 3: Cross multiply
    1,512.78x = 2,269.72 × 691.13
  4. Step 4: Simplify right side
    1,512.78x = 1,568,678.12
  5. Step 5: Solve for x
    x = 1,568,678.12/1,512.78
  6. Step 6: Final answer
    x = 1,036.95

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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.