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Finding the Fourth Proportional to 166.40, 228.60 and 137.20

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Solution

The fourth proportional to 166.40, 228.60 and 137.20 is: 188.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.40 : 228.60 = 137.20 : x
  2. Step 2: Convert to fraction form
    166.40/228.60 = 137.20/x
  3. Step 3: Cross multiply
    166.40x = 228.60 × 137.20
  4. Step 4: Simplify right side
    166.40x = 31,363.92
  5. Step 5: Solve for x
    x = 31,363.92/166.40
  6. Step 6: Final answer
    x = 188.49

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.