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Finding the Fourth Proportional to 1,988.29, 2,982.66 and 672.01

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Solution

The fourth proportional to 1,988.29, 2,982.66 and 672.01 is: 1,008.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.29 : 2,982.66 = 672.01 : x
  2. Step 2: Convert to fraction form
    1,988.29/2,982.66 = 672.01/x
  3. Step 3: Cross multiply
    1,988.29x = 2,982.66 × 672.01
  4. Step 4: Simplify right side
    1,988.29x = 2,004,367.37
  5. Step 5: Solve for x
    x = 2,004,367.37/1,988.29
  6. Step 6: Final answer
    x = 1,008.09

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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.