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Finding the Fourth Proportional to 1,214.85, 1,676.21 and 691.17

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Solution

The fourth proportional to 1,214.85, 1,676.21 and 691.17 is: 953.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.85 : 1,676.21 = 691.17 : x
  2. Step 2: Convert to fraction form
    1,214.85/1,676.21 = 691.17/x
  3. Step 3: Cross multiply
    1,214.85x = 1,676.21 × 691.17
  4. Step 4: Simplify right side
    1,214.85x = 1,158,542.61
  5. Step 5: Solve for x
    x = 1,158,542.61/1,214.85
  6. Step 6: Final answer
    x = 953.65

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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.