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Finding the Fourth Proportional to 672.43, 1,009.05 and 261.61

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Solution

The fourth proportional to 672.43, 1,009.05 and 261.61 is: 392.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.43 : 1,009.05 = 261.61 : x
  2. Step 2: Convert to fraction form
    672.43/1,009.05 = 261.61/x
  3. Step 3: Cross multiply
    672.43x = 1,009.05 × 261.61
  4. Step 4: Simplify right side
    672.43x = 263,977.57
  5. Step 5: Solve for x
    x = 263,977.57/672.43
  6. Step 6: Final answer
    x = 392.57

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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.