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Finding the Fourth Proportional to 218.07, 326.48 and 187.31

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Solution

The fourth proportional to 218.07, 326.48 and 187.31 is: 280.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.07 : 326.48 = 187.31 : x
  2. Step 2: Convert to fraction form
    218.07/326.48 = 187.31/x
  3. Step 3: Cross multiply
    218.07x = 326.48 × 187.31
  4. Step 4: Simplify right side
    218.07x = 61,152.85
  5. Step 5: Solve for x
    x = 61,152.85/218.07
  6. Step 6: Final answer
    x = 280.43

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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.