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Finding the Fourth Proportional to 1,209.29, 1,668.68 and 712.08

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Solution

The fourth proportional to 1,209.29, 1,668.68 and 712.08 is: 982.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.29 : 1,668.68 = 712.08 : x
  2. Step 2: Convert to fraction form
    1,209.29/1,668.68 = 712.08/x
  3. Step 3: Cross multiply
    1,209.29x = 1,668.68 × 712.08
  4. Step 4: Simplify right side
    1,209.29x = 1,188,233.65
  5. Step 5: Solve for x
    x = 1,188,233.65/1,209.29
  6. Step 6: Final answer
    x = 982.59

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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.