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Finding the Fourth Proportional to 613.22, 919.82 and 305.21

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Solution

The fourth proportional to 613.22, 919.82 and 305.21 is: 457.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.22 : 919.82 = 305.21 : x
  2. Step 2: Convert to fraction form
    613.22/919.82 = 305.21/x
  3. Step 3: Cross multiply
    613.22x = 919.82 × 305.21
  4. Step 4: Simplify right side
    613.22x = 280,741.32
  5. Step 5: Solve for x
    x = 280,741.32/613.22
  6. Step 6: Final answer
    x = 457.82

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Double scale
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Similar ratio
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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.