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Finding the Fourth Proportional to 228.46, 342.70 and 137.74

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Solution

The fourth proportional to 228.46, 342.70 and 137.74 is: 206.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.46 : 342.70 = 137.74 : x
  2. Step 2: Convert to fraction form
    228.46/342.70 = 137.74/x
  3. Step 3: Cross multiply
    228.46x = 342.70 × 137.74
  4. Step 4: Simplify right side
    228.46x = 47,203.50
  5. Step 5: Solve for x
    x = 47,203.50/228.46
  6. Step 6: Final answer
    x = 206.62

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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.