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Finding the Fourth Proportional to 788.71, 1,183.21 and 326.40

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Solution

The fourth proportional to 788.71, 1,183.21 and 326.40 is: 489.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.71 : 1,183.21 = 326.40 : x
  2. Step 2: Convert to fraction form
    788.71/1,183.21 = 326.40/x
  3. Step 3: Cross multiply
    788.71x = 1,183.21 × 326.40
  4. Step 4: Simplify right side
    788.71x = 386,199.74
  5. Step 5: Solve for x
    x = 386,199.74/788.71
  6. Step 6: Final answer
    x = 489.66

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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.