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Finding the Fourth Proportional to 853.19, 1,279.85 and 579.17

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Solution

The fourth proportional to 853.19, 1,279.85 and 579.17 is: 868.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.19 : 1,279.85 = 579.17 : x
  2. Step 2: Convert to fraction form
    853.19/1,279.85 = 579.17/x
  3. Step 3: Cross multiply
    853.19x = 1,279.85 × 579.17
  4. Step 4: Simplify right side
    853.19x = 741,247.83
  5. Step 5: Solve for x
    x = 741,247.83/853.19
  6. Step 6: Final answer
    x = 868.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.