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Finding the Fourth Proportional to 672.41, 1,008.61 and 210.20

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Solution

The fourth proportional to 672.41, 1,008.61 and 210.20 is: 315.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.41 : 1,008.61 = 210.20 : x
  2. Step 2: Convert to fraction form
    672.41/1,008.61 = 210.20/x
  3. Step 3: Cross multiply
    672.41x = 1,008.61 × 210.20
  4. Step 4: Simplify right side
    672.41x = 212,005.30
  5. Step 5: Solve for x
    x = 212,005.30/672.41
  6. Step 6: Final answer
    x = 315.29

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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.