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Finding the Fourth Proportional to 221.39, 330.15 and 188.52

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Solution

The fourth proportional to 221.39, 330.15 and 188.52 is: 281.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.39 : 330.15 = 188.52 : x
  2. Step 2: Convert to fraction form
    221.39/330.15 = 188.52/x
  3. Step 3: Cross multiply
    221.39x = 330.15 × 188.52
  4. Step 4: Simplify right side
    221.39x = 62,239.88
  5. Step 5: Solve for x
    x = 62,239.88/221.39
  6. Step 6: Final answer
    x = 281.13

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.