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Finding the Fourth Proportional to 1,169.17, 1,613.39 and 645.23

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Solution

The fourth proportional to 1,169.17, 1,613.39 and 645.23 is: 890.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,169.17 : 1,613.39 = 645.23 : x
  2. Step 2: Convert to fraction form
    1,169.17/1,613.39 = 645.23/x
  3. Step 3: Cross multiply
    1,169.17x = 1,613.39 × 645.23
  4. Step 4: Simplify right side
    1,169.17x = 1,041,008.44
  5. Step 5: Solve for x
    x = 1,041,008.44/1,169.17
  6. Step 6: Final answer
    x = 890.38

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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.