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Finding the Fourth Proportional to 613.08, 917.81 and 381.23

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Solution

The fourth proportional to 613.08, 917.81 and 381.23 is: 570.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.08 : 917.81 = 381.23 : x
  2. Step 2: Convert to fraction form
    613.08/917.81 = 381.23/x
  3. Step 3: Cross multiply
    613.08x = 917.81 × 381.23
  4. Step 4: Simplify right side
    613.08x = 349,890.21
  5. Step 5: Solve for x
    x = 349,890.21/613.08
  6. Step 6: Final answer
    x = 570.71

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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.