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Finding the Fourth Proportional to 711, 1,067.31 and 326.25

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Solution

The fourth proportional to 711, 1,067.31 and 326.25 is: 489.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    711 : 1,067.31 = 326.25 : x
  2. Step 2: Convert to fraction form
    711/1,067.31 = 326.25/x
  3. Step 3: Cross multiply
    711x = 1,067.31 × 326.25
  4. Step 4: Simplify right side
    711x = 348,209.89
  5. Step 5: Solve for x
    x = 348,209.89/711
  6. Step 6: Final answer
    x = 489.75

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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.