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Finding the Fourth Proportional to 874.12, 1,206.79 and 579.79

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Solution

The fourth proportional to 874.12, 1,206.79 and 579.79 is: 800.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.12 : 1,206.79 = 579.79 : x
  2. Step 2: Convert to fraction form
    874.12/1,206.79 = 579.79/x
  3. Step 3: Cross multiply
    874.12x = 1,206.79 × 579.79
  4. Step 4: Simplify right side
    874.12x = 699,684.77
  5. Step 5: Solve for x
    x = 699,684.77/874.12
  6. Step 6: Final answer
    x = 800.44

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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.