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Finding the Fourth Proportional to 788.90, 1,183.61 and 326.90

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Solution

The fourth proportional to 788.90, 1,183.61 and 326.90 is: 490.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.90 : 1,183.61 = 326.90 : x
  2. Step 2: Convert to fraction form
    788.90/1,183.61 = 326.90/x
  3. Step 3: Cross multiply
    788.90x = 1,183.61 × 326.90
  4. Step 4: Simplify right side
    788.90x = 386,914.56
  5. Step 5: Solve for x
    x = 386,914.56/788.90
  6. Step 6: Final answer
    x = 490.45

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1.5x scale

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.