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Finding the Fourth Proportional to 874.67, 1,311.91 and 289.64

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Solution

The fourth proportional to 874.67, 1,311.91 and 289.64 is: 434.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.67 : 1,311.91 = 289.64 : x
  2. Step 2: Convert to fraction form
    874.67/1,311.91 = 289.64/x
  3. Step 3: Cross multiply
    874.67x = 1,311.91 × 289.64
  4. Step 4: Simplify right side
    874.67x = 379,985.80
  5. Step 5: Solve for x
    x = 379,985.80/874.67
  6. Step 6: Final answer
    x = 434.44

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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.