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Finding the Fourth Proportional to 228.20, 342.20 and 91.22

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Solution

The fourth proportional to 228.20, 342.20 and 91.22 is: 136.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.20 : 342.20 = 91.22 : x
  2. Step 2: Convert to fraction form
    228.20/342.20 = 91.22/x
  3. Step 3: Cross multiply
    228.20x = 342.20 × 91.22
  4. Step 4: Simplify right side
    228.20x = 31,214.00
  5. Step 5: Solve for x
    x = 31,214.00/228.20
  6. Step 6: Final answer
    x = 136.79

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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.