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Finding the Fourth Proportional to 672.27, 1,008.71 and 661.34

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Solution

The fourth proportional to 672.27, 1,008.71 and 661.34 is: 992.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.27 : 1,008.71 = 661.34 : x
  2. Step 2: Convert to fraction form
    672.27/1,008.71 = 661.34/x
  3. Step 3: Cross multiply
    672.27x = 1,008.71 × 661.34
  4. Step 4: Simplify right side
    672.27x = 667,091.92
  5. Step 5: Solve for x
    x = 667,091.92/672.27
  6. Step 6: Final answer
    x = 992.30

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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.