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Finding the Fourth Proportional to 247.40, 371.10 and 212.60

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Solution

The fourth proportional to 247.40, 371.10 and 212.60 is: 318.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.40 : 371.10 = 212.60 : x
  2. Step 2: Convert to fraction form
    247.40/371.10 = 212.60/x
  3. Step 3: Cross multiply
    247.40x = 371.10 × 212.60
  4. Step 4: Simplify right side
    247.40x = 78,895.86
  5. Step 5: Solve for x
    x = 78,895.86/247.40
  6. Step 6: Final answer
    x = 318.90

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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.