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Finding the Fourth Proportional to 613.29, 919.90 and 338.53

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Solution

The fourth proportional to 613.29, 919.90 and 338.53 is: 507.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.29 : 919.90 = 338.53 : x
  2. Step 2: Convert to fraction form
    613.29/919.90 = 338.53/x
  3. Step 3: Cross multiply
    613.29x = 919.90 × 338.53
  4. Step 4: Simplify right side
    613.29x = 311,413.75
  5. Step 5: Solve for x
    x = 311,413.75/613.29
  6. Step 6: Final answer
    x = 507.78

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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.