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Finding the Fourth Proportional to 1,308.12, 1,961.37 and 691.44

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Solution

The fourth proportional to 1,308.12, 1,961.37 and 691.44 is: 1,036.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.12 : 1,961.37 = 691.44 : x
  2. Step 2: Convert to fraction form
    1,308.12/1,961.37 = 691.44/x
  3. Step 3: Cross multiply
    1,308.12x = 1,961.37 × 691.44
  4. Step 4: Simplify right side
    1,308.12x = 1,356,169.67
  5. Step 5: Solve for x
    x = 1,356,169.67/1,308.12
  6. Step 6: Final answer
    x = 1,036.73

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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.