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Finding the Fourth Proportional to 874.48, 1,311.45 and 387.94

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Solution

The fourth proportional to 874.48, 1,311.45 and 387.94 is: 581.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.48 : 1,311.45 = 387.94 : x
  2. Step 2: Convert to fraction form
    874.48/1,311.45 = 387.94/x
  3. Step 3: Cross multiply
    874.48x = 1,311.45 × 387.94
  4. Step 4: Simplify right side
    874.48x = 508,763.91
  5. Step 5: Solve for x
    x = 508,763.91/874.48
  6. Step 6: Final answer
    x = 581.79

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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.