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Finding the Fourth Proportional to 613.20, 919.86 and 247.90

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Solution

The fourth proportional to 613.20, 919.86 and 247.90 is: 371.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.20 : 919.86 = 247.90 : x
  2. Step 2: Convert to fraction form
    613.20/919.86 = 247.90/x
  3. Step 3: Cross multiply
    613.20x = 919.86 × 247.90
  4. Step 4: Simplify right side
    613.20x = 228,033.29
  5. Step 5: Solve for x
    x = 228,033.29/613.20
  6. Step 6: Final answer
    x = 371.87

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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.