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Finding the Fourth Proportional to 672.74, 1,008.42 and 379.82

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Solution

The fourth proportional to 672.74, 1,008.42 and 379.82 is: 569.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.74 : 1,008.42 = 379.82 : x
  2. Step 2: Convert to fraction form
    672.74/1,008.42 = 379.82/x
  3. Step 3: Cross multiply
    672.74x = 1,008.42 × 379.82
  4. Step 4: Simplify right side
    672.74x = 383,018.08
  5. Step 5: Solve for x
    x = 383,018.08/672.74
  6. Step 6: Final answer
    x = 569.34

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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.