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Finding the Fourth Proportional to 1,311.30, 1,966.68 and 764.54

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Solution

The fourth proportional to 1,311.30, 1,966.68 and 764.54 is: 1,146.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.30 : 1,966.68 = 764.54 : x
  2. Step 2: Convert to fraction form
    1,311.30/1,966.68 = 764.54/x
  3. Step 3: Cross multiply
    1,311.30x = 1,966.68 × 764.54
  4. Step 4: Simplify right side
    1,311.30x = 1,503,605.53
  5. Step 5: Solve for x
    x = 1,503,605.53/1,311.30
  6. Step 6: Final answer
    x = 1,146.65

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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.