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Finding the Fourth Proportional to 1,189.12, 1,641.18 and 691.84

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Solution

The fourth proportional to 1,189.12, 1,641.18 and 691.84 is: 954.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.12 : 1,641.18 = 691.84 : x
  2. Step 2: Convert to fraction form
    1,189.12/1,641.18 = 691.84/x
  3. Step 3: Cross multiply
    1,189.12x = 1,641.18 × 691.84
  4. Step 4: Simplify right side
    1,189.12x = 1,135,433.97
  5. Step 5: Solve for x
    x = 1,135,433.97/1,189.12
  6. Step 6: Final answer
    x = 954.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.