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Finding the Fourth Proportional to 874.42, 1,206.32 and 520.37

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Solution

The fourth proportional to 874.42, 1,206.32 and 520.37 is: 717.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.42 : 1,206.32 = 520.37 : x
  2. Step 2: Convert to fraction form
    874.42/1,206.32 = 520.37/x
  3. Step 3: Cross multiply
    874.42x = 1,206.32 × 520.37
  4. Step 4: Simplify right side
    874.42x = 627,732.74
  5. Step 5: Solve for x
    x = 627,732.74/874.42
  6. Step 6: Final answer
    x = 717.88

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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.