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Finding the Fourth Proportional to 1,169.91, 1,614.43 and 638.80

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Solution

The fourth proportional to 1,169.91, 1,614.43 and 638.80 is: 881.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,169.91 : 1,614.43 = 638.80 : x
  2. Step 2: Convert to fraction form
    1,169.91/1,614.43 = 638.80/x
  3. Step 3: Cross multiply
    1,169.91x = 1,614.43 × 638.80
  4. Step 4: Simplify right side
    1,169.91x = 1,031,296.92
  5. Step 5: Solve for x
    x = 1,031,296.92/1,169.91
  6. Step 6: Final answer
    x = 881.52

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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.