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Finding the Fourth Proportional to 228.42, 342.37 and 91.27

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Solution

The fourth proportional to 228.42, 342.37 and 91.27 is: 136.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.42 : 342.37 = 91.27 : x
  2. Step 2: Convert to fraction form
    228.42/342.37 = 91.27/x
  3. Step 3: Cross multiply
    228.42x = 342.37 × 91.27
  4. Step 4: Simplify right side
    228.42x = 31,248.11
  5. Step 5: Solve for x
    x = 31,248.11/228.42
  6. Step 6: Final answer
    x = 136.80

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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.