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Finding the Fourth Proportional to 1,989.07, 2,982.60 and 672.28

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Solution

The fourth proportional to 1,989.07, 2,982.60 and 672.28 is: 1,008.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.07 : 2,982.60 = 672.28 : x
  2. Step 2: Convert to fraction form
    1,989.07/2,982.60 = 672.28/x
  3. Step 3: Cross multiply
    1,989.07x = 2,982.60 × 672.28
  4. Step 4: Simplify right side
    1,989.07x = 2,005,142.33
  5. Step 5: Solve for x
    x = 2,005,142.33/1,989.07
  6. Step 6: Final answer
    x = 1,008.08

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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.