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Finding the Fourth Proportional to 1,169.31, 1,613.63 and 645.33

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Solution

The fourth proportional to 1,169.31, 1,613.63 and 645.33 is: 890.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,169.31 : 1,613.63 = 645.33 : x
  2. Step 2: Convert to fraction form
    1,169.31/1,613.63 = 645.33/x
  3. Step 3: Cross multiply
    1,169.31x = 1,613.63 × 645.33
  4. Step 4: Simplify right side
    1,169.31x = 1,041,320.62
  5. Step 5: Solve for x
    x = 1,041,320.62/1,169.31
  6. Step 6: Final answer
    x = 890.54

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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.