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Finding the Fourth Proportional to 247.90, 341.76 and 218.74

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Solution

The fourth proportional to 247.90, 341.76 and 218.74 is: 301.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.90 : 341.76 = 218.74 : x
  2. Step 2: Convert to fraction form
    247.90/341.76 = 218.74/x
  3. Step 3: Cross multiply
    247.90x = 341.76 × 218.74
  4. Step 4: Simplify right side
    247.90x = 74,756.58
  5. Step 5: Solve for x
    x = 74,756.58/247.90
  6. Step 6: Final answer
    x = 301.56

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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.