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Finding the Fourth Proportional to 808.13, 1,212.66 and 672.82

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Solution

The fourth proportional to 808.13, 1,212.66 and 672.82 is: 1,009.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.13 : 1,212.66 = 672.82 : x
  2. Step 2: Convert to fraction form
    808.13/1,212.66 = 672.82/x
  3. Step 3: Cross multiply
    808.13x = 1,212.66 × 672.82
  4. Step 4: Simplify right side
    808.13x = 815,901.90
  5. Step 5: Solve for x
    x = 815,901.90/808.13
  6. Step 6: Final answer
    x = 1,009.62

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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.