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Finding the Fourth Proportional to 672.20, 1,008.34 and 347.48

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Solution

The fourth proportional to 672.20, 1,008.34 and 347.48 is: 521.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.20 : 1,008.34 = 347.48 : x
  2. Step 2: Convert to fraction form
    672.20/1,008.34 = 347.48/x
  3. Step 3: Cross multiply
    672.20x = 1,008.34 × 347.48
  4. Step 4: Simplify right side
    672.20x = 350,377.98
  5. Step 5: Solve for x
    x = 350,377.98/672.20
  6. Step 6: Final answer
    x = 521.24

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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.