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Finding the Fourth Proportional to 1,322.91, 1,981.49 and 672.29

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Solution

The fourth proportional to 1,322.91, 1,981.49 and 672.29 is: 1,006.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,322.91 : 1,981.49 = 672.29 : x
  2. Step 2: Convert to fraction form
    1,322.91/1,981.49 = 672.29/x
  3. Step 3: Cross multiply
    1,322.91x = 1,981.49 × 672.29
  4. Step 4: Simplify right side
    1,322.91x = 1,332,122.64
  5. Step 5: Solve for x
    x = 1,332,122.64/1,322.91
  6. Step 6: Final answer
    x = 1,006.96

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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.