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Finding the Fourth Proportional to 1,321.82, 1,981.30 and 672.60

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Solution

The fourth proportional to 1,321.82, 1,981.30 and 672.60 is: 1,008.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.82 : 1,981.30 = 672.60 : x
  2. Step 2: Convert to fraction form
    1,321.82/1,981.30 = 672.60/x
  3. Step 3: Cross multiply
    1,321.82x = 1,981.30 × 672.60
  4. Step 4: Simplify right side
    1,321.82x = 1,332,622.38
  5. Step 5: Solve for x
    x = 1,332,622.38/1,321.82
  6. Step 6: Final answer
    x = 1,008.17

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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.