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Finding the Fourth Proportional to 1,209.86, 1,669.02 and 712.47

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Solution

The fourth proportional to 1,209.86, 1,669.02 and 712.47 is: 982.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.86 : 1,669.02 = 712.47 : x
  2. Step 2: Convert to fraction form
    1,209.86/1,669.02 = 712.47/x
  3. Step 3: Cross multiply
    1,209.86x = 1,669.02 × 712.47
  4. Step 4: Simplify right side
    1,209.86x = 1,189,126.68
  5. Step 5: Solve for x
    x = 1,189,126.68/1,209.86
  6. Step 6: Final answer
    x = 982.86

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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.