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Finding the Fourth Proportional to 874.35, 1,311.12 and 257.90

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Solution

The fourth proportional to 874.35, 1,311.12 and 257.90 is: 386.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.35 : 1,311.12 = 257.90 : x
  2. Step 2: Convert to fraction form
    874.35/1,311.12 = 257.90/x
  3. Step 3: Cross multiply
    874.35x = 1,311.12 × 257.90
  4. Step 4: Simplify right side
    874.35x = 338,131.29
  5. Step 5: Solve for x
    x = 338,131.29/874.35
  6. Step 6: Final answer
    x = 386.72

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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.