Home / 1,279.91-1,766.24-720.43

Finding the Fourth Proportional to 1,279.91, 1,766.24 and 720.43

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Solution

The fourth proportional to 1,279.91, 1,766.24 and 720.43 is: 994.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.91 : 1,766.24 = 720.43 : x
  2. Step 2: Convert to fraction form
    1,279.91/1,766.24 = 720.43/x
  3. Step 3: Cross multiply
    1,279.91x = 1,766.24 × 720.43
  4. Step 4: Simplify right side
    1,279.91x = 1,272,451.02
  5. Step 5: Solve for x
    x = 1,272,451.02/1,279.91
  6. Step 6: Final answer
    x = 994.17

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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.