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Finding the Fourth Proportional to 672.09, 1,008.06 and 209.85

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Solution

The fourth proportional to 672.09, 1,008.06 and 209.85 is: 314.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.09 : 1,008.06 = 209.85 : x
  2. Step 2: Convert to fraction form
    672.09/1,008.06 = 209.85/x
  3. Step 3: Cross multiply
    672.09x = 1,008.06 × 209.85
  4. Step 4: Simplify right side
    672.09x = 211,541.39
  5. Step 5: Solve for x
    x = 211,541.39/672.09
  6. Step 6: Final answer
    x = 314.75

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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.