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Finding the Fourth Proportional to 1,987.92, 2,979.81 and 671.22

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Solution

The fourth proportional to 1,987.92, 2,979.81 and 671.22 is: 1,006.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.92 : 2,979.81 = 671.22 : x
  2. Step 2: Convert to fraction form
    1,987.92/2,979.81 = 671.22/x
  3. Step 3: Cross multiply
    1,987.92x = 2,979.81 × 671.22
  4. Step 4: Simplify right side
    1,987.92x = 2,000,116.73
  5. Step 5: Solve for x
    x = 2,000,116.73/1,987.92
  6. Step 6: Final answer
    x = 1,006.13

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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.