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Finding the Fourth Proportional to 613.21, 919.80 and 247.99

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Solution

The fourth proportional to 613.21, 919.80 and 247.99 is: 371.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.21 : 919.80 = 247.99 : x
  2. Step 2: Convert to fraction form
    613.21/919.80 = 247.99/x
  3. Step 3: Cross multiply
    613.21x = 919.80 × 247.99
  4. Step 4: Simplify right side
    613.21x = 228,101.20
  5. Step 5: Solve for x
    x = 228,101.20/613.21
  6. Step 6: Final answer
    x = 371.98

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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.