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Finding the Fourth Proportional to 228.12, 342.28 and 91.27

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Solution

The fourth proportional to 228.12, 342.28 and 91.27 is: 136.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.12 : 342.28 = 91.27 : x
  2. Step 2: Convert to fraction form
    228.12/342.28 = 91.27/x
  3. Step 3: Cross multiply
    228.12x = 342.28 × 91.27
  4. Step 4: Simplify right side
    228.12x = 31,239.15
  5. Step 5: Solve for x
    x = 31,239.15/228.12
  6. Step 6: Final answer
    x = 136.94

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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.