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Finding the Fourth Proportional to 221.58, 332.28 and 91.58

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Solution

The fourth proportional to 221.58, 332.28 and 91.58 is: 137.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.58 : 332.28 = 91.58 : x
  2. Step 2: Convert to fraction form
    221.58/332.28 = 91.58/x
  3. Step 3: Cross multiply
    221.58x = 332.28 × 91.58
  4. Step 4: Simplify right side
    221.58x = 30,428.54
  5. Step 5: Solve for x
    x = 30,428.54/221.58
  6. Step 6: Final answer
    x = 137.33

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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.