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Finding the Fourth Proportional to 1,311.62, 1,967.85 and 531.78

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Solution

The fourth proportional to 1,311.62, 1,967.85 and 531.78 is: 797.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.62 : 1,967.85 = 531.78 : x
  2. Step 2: Convert to fraction form
    1,311.62/1,967.85 = 531.78/x
  3. Step 3: Cross multiply
    1,311.62x = 1,967.85 × 531.78
  4. Step 4: Simplify right side
    1,311.62x = 1,046,463.27
  5. Step 5: Solve for x
    x = 1,046,463.27/1,311.62
  6. Step 6: Final answer
    x = 797.84

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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.