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Finding the Fourth Proportional to 672.74, 1,004.09 and 656.34

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Solution

The fourth proportional to 672.74, 1,004.09 and 656.34 is: 979.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.74 : 1,004.09 = 656.34 : x
  2. Step 2: Convert to fraction form
    672.74/1,004.09 = 656.34/x
  3. Step 3: Cross multiply
    672.74x = 1,004.09 × 656.34
  4. Step 4: Simplify right side
    672.74x = 659,024.43
  5. Step 5: Solve for x
    x = 659,024.43/672.74
  6. Step 6: Final answer
    x = 979.61

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.