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Finding the Fourth Proportional to 613.18, 919.68 and 217.81

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Solution

The fourth proportional to 613.18, 919.68 and 217.81 is: 326.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.18 : 919.68 = 217.81 : x
  2. Step 2: Convert to fraction form
    613.18/919.68 = 217.81/x
  3. Step 3: Cross multiply
    613.18x = 919.68 × 217.81
  4. Step 4: Simplify right side
    613.18x = 200,315.50
  5. Step 5: Solve for x
    x = 200,315.50/613.18
  6. Step 6: Final answer
    x = 326.68

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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.