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Finding the Fourth Proportional to 874.40, 1,206.39 and 579.35

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Solution

The fourth proportional to 874.40, 1,206.39 and 579.35 is: 799.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.40 : 1,206.39 = 579.35 : x
  2. Step 2: Convert to fraction form
    874.40/1,206.39 = 579.35/x
  3. Step 3: Cross multiply
    874.40x = 1,206.39 × 579.35
  4. Step 4: Simplify right side
    874.40x = 698,927.24
  5. Step 5: Solve for x
    x = 698,927.24/874.40
  6. Step 6: Final answer
    x = 799.33

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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.