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Finding the Fourth Proportional to 321.60, 443.70 and 247.80

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Solution

The fourth proportional to 321.60, 443.70 and 247.80 is: 341.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.60 : 443.70 = 247.80 : x
  2. Step 2: Convert to fraction form
    321.60/443.70 = 247.80/x
  3. Step 3: Cross multiply
    321.60x = 443.70 × 247.80
  4. Step 4: Simplify right side
    321.60x = 109,948.86
  5. Step 5: Solve for x
    x = 109,948.86/321.60
  6. Step 6: Final answer
    x = 341.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.