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Finding the Fourth Proportional to 1,321.38, 1,979.49 and 627.06

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Solution

The fourth proportional to 1,321.38, 1,979.49 and 627.06 is: 939.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.38 : 1,979.49 = 627.06 : x
  2. Step 2: Convert to fraction form
    1,321.38/1,979.49 = 627.06/x
  3. Step 3: Cross multiply
    1,321.38x = 1,979.49 × 627.06
  4. Step 4: Simplify right side
    1,321.38x = 1,241,259.00
  5. Step 5: Solve for x
    x = 1,241,259.00/1,321.38
  6. Step 6: Final answer
    x = 939.37

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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.