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Finding the Fourth Proportional to 247.42, 370.86 and 218.56

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Solution

The fourth proportional to 247.42, 370.86 and 218.56 is: 327.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.42 : 370.86 = 218.56 : x
  2. Step 2: Convert to fraction form
    247.42/370.86 = 218.56/x
  3. Step 3: Cross multiply
    247.42x = 370.86 × 218.56
  4. Step 4: Simplify right side
    247.42x = 81,055.16
  5. Step 5: Solve for x
    x = 81,055.16/247.42
  6. Step 6: Final answer
    x = 327.60

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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.