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Finding the Fourth Proportional to 221.90, 332.78 and 185.58

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Solution

The fourth proportional to 221.90, 332.78 and 185.58 is: 278.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.90 : 332.78 = 185.58 : x
  2. Step 2: Convert to fraction form
    221.90/332.78 = 185.58/x
  3. Step 3: Cross multiply
    221.90x = 332.78 × 185.58
  4. Step 4: Simplify right side
    221.90x = 61,757.31
  5. Step 5: Solve for x
    x = 61,757.31/221.90
  6. Step 6: Final answer
    x = 278.31

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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.