Home / 1,215.20-1,676.49-691.13

Finding the Fourth Proportional to 1,215.20, 1,676.49 and 691.13

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Solution

The fourth proportional to 1,215.20, 1,676.49 and 691.13 is: 953.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.20 : 1,676.49 = 691.13 : x
  2. Step 2: Convert to fraction form
    1,215.20/1,676.49 = 691.13/x
  3. Step 3: Cross multiply
    1,215.20x = 1,676.49 × 691.13
  4. Step 4: Simplify right side
    1,215.20x = 1,158,672.53
  5. Step 5: Solve for x
    x = 1,158,672.53/1,215.20
  6. Step 6: Final answer
    x = 953.48

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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.