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Finding the Fourth Proportional to 672.15, 1,008.27 and 209.89

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Solution

The fourth proportional to 672.15, 1,008.27 and 209.89 is: 314.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.15 : 1,008.27 = 209.89 : x
  2. Step 2: Convert to fraction form
    672.15/1,008.27 = 209.89/x
  3. Step 3: Cross multiply
    672.15x = 1,008.27 × 209.89
  4. Step 4: Simplify right side
    672.15x = 211,625.79
  5. Step 5: Solve for x
    x = 211,625.79/672.15
  6. Step 6: Final answer
    x = 314.85

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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.