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Finding the Fourth Proportional to 1,113.38, 1,668.70 and 806.29

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Solution

The fourth proportional to 1,113.38, 1,668.70 and 806.29 is: 1,208.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.38 : 1,668.70 = 806.29 : x
  2. Step 2: Convert to fraction form
    1,113.38/1,668.70 = 806.29/x
  3. Step 3: Cross multiply
    1,113.38x = 1,668.70 × 806.29
  4. Step 4: Simplify right side
    1,113.38x = 1,345,452.96
  5. Step 5: Solve for x
    x = 1,345,452.96/1,113.38
  6. Step 6: Final answer
    x = 1,208.44

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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.