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Finding the Fourth Proportional to 789.15, 1,182.69 and 326.40

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Solution

The fourth proportional to 789.15, 1,182.69 and 326.40 is: 489.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.15 : 1,182.69 = 326.40 : x
  2. Step 2: Convert to fraction form
    789.15/1,182.69 = 326.40/x
  3. Step 3: Cross multiply
    789.15x = 1,182.69 × 326.40
  4. Step 4: Simplify right side
    789.15x = 386,030.02
  5. Step 5: Solve for x
    x = 386,030.02/789.15
  6. Step 6: Final answer
    x = 489.17

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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.