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Finding the Fourth Proportional to 1,311.76, 1,966 and 580.56

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Solution

The fourth proportional to 1,311.76, 1,966 and 580.56 is: 870.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.76 : 1,966 = 580.56 : x
  2. Step 2: Convert to fraction form
    1,311.76/1,966 = 580.56/x
  3. Step 3: Cross multiply
    1,311.76x = 1,966 × 580.56
  4. Step 4: Simplify right side
    1,311.76x = 1,141,380.96
  5. Step 5: Solve for x
    x = 1,141,380.96/1,311.76
  6. Step 6: Final answer
    x = 870.11

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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.