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Finding the Fourth Proportional to 228.21, 342.24 and 91.17

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Solution

The fourth proportional to 228.21, 342.24 and 91.17 is: 136.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.21 : 342.24 = 91.17 : x
  2. Step 2: Convert to fraction form
    228.21/342.24 = 91.17/x
  3. Step 3: Cross multiply
    228.21x = 342.24 × 91.17
  4. Step 4: Simplify right side
    228.21x = 31,202.02
  5. Step 5: Solve for x
    x = 31,202.02/228.21
  6. Step 6: Final answer
    x = 136.73

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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.