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Finding the Fourth Proportional to 1,311.70, 1,965.24 and 694.04

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Solution

The fourth proportional to 1,311.70, 1,965.24 and 694.04 is: 1,039.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.70 : 1,965.24 = 694.04 : x
  2. Step 2: Convert to fraction form
    1,311.70/1,965.24 = 694.04/x
  3. Step 3: Cross multiply
    1,311.70x = 1,965.24 × 694.04
  4. Step 4: Simplify right side
    1,311.70x = 1,363,955.17
  5. Step 5: Solve for x
    x = 1,363,955.17/1,311.70
  6. Step 6: Final answer
    x = 1,039.84

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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.