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Finding the Fourth Proportional to 672.03, 1,007.51 and 261.09

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Solution

The fourth proportional to 672.03, 1,007.51 and 261.09 is: 391.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.03 : 1,007.51 = 261.09 : x
  2. Step 2: Convert to fraction form
    672.03/1,007.51 = 261.09/x
  3. Step 3: Cross multiply
    672.03x = 1,007.51 × 261.09
  4. Step 4: Simplify right side
    672.03x = 263,049.48
  5. Step 5: Solve for x
    x = 263,049.48/672.03
  6. Step 6: Final answer
    x = 391.43

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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.