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Finding the Fourth Proportional to 788.50, 1,183.48 and 398.78

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Solution

The fourth proportional to 788.50, 1,183.48 and 398.78 is: 598.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.50 : 1,183.48 = 398.78 : x
  2. Step 2: Convert to fraction form
    788.50/1,183.48 = 398.78/x
  3. Step 3: Cross multiply
    788.50x = 1,183.48 × 398.78
  4. Step 4: Simplify right side
    788.50x = 471,940.24
  5. Step 5: Solve for x
    x = 471,940.24/788.50
  6. Step 6: Final answer
    x = 598.53

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Double scale
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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.