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Finding the Fourth Proportional to 874.62, 1,206.87 and 520.55

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Solution

The fourth proportional to 874.62, 1,206.87 and 520.55 is: 718.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.62 : 1,206.87 = 520.55 : x
  2. Step 2: Convert to fraction form
    874.62/1,206.87 = 520.55/x
  3. Step 3: Cross multiply
    874.62x = 1,206.87 × 520.55
  4. Step 4: Simplify right side
    874.62x = 628,236.18
  5. Step 5: Solve for x
    x = 628,236.18/874.62
  6. Step 6: Final answer
    x = 718.30

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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.