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Finding the Fourth Proportional to 1,112.32, 1,665.36 and 694.56

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Solution

The fourth proportional to 1,112.32, 1,665.36 and 694.56 is: 1,039.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.32 : 1,665.36 = 694.56 : x
  2. Step 2: Convert to fraction form
    1,112.32/1,665.36 = 694.56/x
  3. Step 3: Cross multiply
    1,112.32x = 1,665.36 × 694.56
  4. Step 4: Simplify right side
    1,112.32x = 1,156,692.44
  5. Step 5: Solve for x
    x = 1,156,692.44/1,112.32
  6. Step 6: Final answer
    x = 1,039.89

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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.