Home / 1,217.20-1,679.10-718.97

Finding the Fourth Proportional to 1,217.20, 1,679.10 and 718.97

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Solution

The fourth proportional to 1,217.20, 1,679.10 and 718.97 is: 991.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.20 : 1,679.10 = 718.97 : x
  2. Step 2: Convert to fraction form
    1,217.20/1,679.10 = 718.97/x
  3. Step 3: Cross multiply
    1,217.20x = 1,679.10 × 718.97
  4. Step 4: Simplify right side
    1,217.20x = 1,207,222.53
  5. Step 5: Solve for x
    x = 1,207,222.53/1,217.20
  6. Step 6: Final answer
    x = 991.80

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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.