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Finding the Fourth Proportional to 613.11, 919.89 and 284.21

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Solution

The fourth proportional to 613.11, 919.89 and 284.21 is: 426.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.11 : 919.89 = 284.21 : x
  2. Step 2: Convert to fraction form
    613.11/919.89 = 284.21/x
  3. Step 3: Cross multiply
    613.11x = 919.89 × 284.21
  4. Step 4: Simplify right side
    613.11x = 261,436.27
  5. Step 5: Solve for x
    x = 261,436.27/613.11
  6. Step 6: Final answer
    x = 426.41

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Double scale
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Similar ratio
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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.