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Finding the Fourth Proportional to 1,209.87, 1,669.01 and 712.49

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Solution

The fourth proportional to 1,209.87, 1,669.01 and 712.49 is: 982.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.87 : 1,669.01 = 712.49 : x
  2. Step 2: Convert to fraction form
    1,209.87/1,669.01 = 712.49/x
  3. Step 3: Cross multiply
    1,209.87x = 1,669.01 × 712.49
  4. Step 4: Simplify right side
    1,209.87x = 1,189,141.03
  5. Step 5: Solve for x
    x = 1,189,141.03/1,209.87
  6. Step 6: Final answer
    x = 982.87

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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.