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Finding the Fourth Proportional to 1,311.56, 1,966.58 and 695.56

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Solution

The fourth proportional to 1,311.56, 1,966.58 and 695.56 is: 1,042.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.56 : 1,966.58 = 695.56 : x
  2. Step 2: Convert to fraction form
    1,311.56/1,966.58 = 695.56/x
  3. Step 3: Cross multiply
    1,311.56x = 1,966.58 × 695.56
  4. Step 4: Simplify right side
    1,311.56x = 1,367,874.38
  5. Step 5: Solve for x
    x = 1,367,874.38/1,311.56
  6. Step 6: Final answer
    x = 1,042.94

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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.