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Finding the Fourth Proportional to 1,986.13, 2,979.24 and 754.12

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Solution

The fourth proportional to 1,986.13, 2,979.24 and 754.12 is: 1,131.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.13 : 2,979.24 = 754.12 : x
  2. Step 2: Convert to fraction form
    1,986.13/2,979.24 = 754.12/x
  3. Step 3: Cross multiply
    1,986.13x = 2,979.24 × 754.12
  4. Step 4: Simplify right side
    1,986.13x = 2,246,704.47
  5. Step 5: Solve for x
    x = 2,246,704.47/1,986.13
  6. Step 6: Final answer
    x = 1,131.20

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1.5x scale

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.