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Finding the Fourth Proportional to 228.28, 342.15 and 91.24

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Solution

The fourth proportional to 228.28, 342.15 and 91.24 is: 136.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.28 : 342.15 = 91.24 : x
  2. Step 2: Convert to fraction form
    228.28/342.15 = 91.24/x
  3. Step 3: Cross multiply
    228.28x = 342.15 × 91.24
  4. Step 4: Simplify right side
    228.28x = 31,217.77
  5. Step 5: Solve for x
    x = 31,217.77/228.28
  6. Step 6: Final answer
    x = 136.75

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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.