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Finding the Fourth Proportional to 1,324.40, 1,986.60 and 1,187.60

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Solution

The fourth proportional to 1,324.40, 1,986.60 and 1,187.60 is: 1,781.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,324.40 : 1,986.60 = 1,187.60 : x
  2. Step 2: Convert to fraction form
    1,324.40/1,986.60 = 1,187.60/x
  3. Step 3: Cross multiply
    1,324.40x = 1,986.60 × 1,187.60
  4. Step 4: Simplify right side
    1,324.40x = 2,359,286.16
  5. Step 5: Solve for x
    x = 2,359,286.16/1,324.40
  6. Step 6: Final answer
    x = 1,781.40

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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.