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Finding the Fourth Proportional to 1,169.87, 1,614.44 and 638.75

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Solution

The fourth proportional to 1,169.87, 1,614.44 and 638.75 is: 881.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,169.87 : 1,614.44 = 638.75 : x
  2. Step 2: Convert to fraction form
    1,169.87/1,614.44 = 638.75/x
  3. Step 3: Cross multiply
    1,169.87x = 1,614.44 × 638.75
  4. Step 4: Simplify right side
    1,169.87x = 1,031,229.18
  5. Step 5: Solve for x
    x = 1,031,229.18/1,169.87
  6. Step 6: Final answer
    x = 881.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.