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Finding the Fourth Proportional to 1,209.78, 1,668.93 and 712.10

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Solution

The fourth proportional to 1,209.78, 1,668.93 and 712.10 is: 982.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.78 : 1,668.93 = 712.10 : x
  2. Step 2: Convert to fraction form
    1,209.78/1,668.93 = 712.10/x
  3. Step 3: Cross multiply
    1,209.78x = 1,668.93 × 712.10
  4. Step 4: Simplify right side
    1,209.78x = 1,188,445.05
  5. Step 5: Solve for x
    x = 1,188,445.05/1,209.78
  6. Step 6: Final answer
    x = 982.36

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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.