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Finding the Fourth Proportional to 228.29, 342.60 and 91.43

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Solution

The fourth proportional to 228.29, 342.60 and 91.43 is: 137.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.29 : 342.60 = 91.43 : x
  2. Step 2: Convert to fraction form
    228.29/342.60 = 91.43/x
  3. Step 3: Cross multiply
    228.29x = 342.60 × 91.43
  4. Step 4: Simplify right side
    228.29x = 31,323.92
  5. Step 5: Solve for x
    x = 31,323.92/228.29
  6. Step 6: Final answer
    x = 137.21

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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.