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Finding the Fourth Proportional to 874.42, 1,311.34 and 387.46

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Solution

The fourth proportional to 874.42, 1,311.34 and 387.46 is: 581.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.42 : 1,311.34 = 387.46 : x
  2. Step 2: Convert to fraction form
    874.42/1,311.34 = 387.46/x
  3. Step 3: Cross multiply
    874.42x = 1,311.34 × 387.46
  4. Step 4: Simplify right side
    874.42x = 508,091.80
  5. Step 5: Solve for x
    x = 508,091.80/874.42
  6. Step 6: Final answer
    x = 581.06

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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.