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Finding the Fourth Proportional to 1,311.67, 1,967.19 and 580.84

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Solution

The fourth proportional to 1,311.67, 1,967.19 and 580.84 is: 871.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.67 : 1,967.19 = 580.84 : x
  2. Step 2: Convert to fraction form
    1,311.67/1,967.19 = 580.84/x
  3. Step 3: Cross multiply
    1,311.67x = 1,967.19 × 580.84
  4. Step 4: Simplify right side
    1,311.67x = 1,142,622.64
  5. Step 5: Solve for x
    x = 1,142,622.64/1,311.67
  6. Step 6: Final answer
    x = 871.12

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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.