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Finding the Fourth Proportional to 166.20, 248.10 and 139.20

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Solution

The fourth proportional to 166.20, 248.10 and 139.20 is: 207.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.20 : 248.10 = 139.20 : x
  2. Step 2: Convert to fraction form
    166.20/248.10 = 139.20/x
  3. Step 3: Cross multiply
    166.20x = 248.10 × 139.20
  4. Step 4: Simplify right side
    166.20x = 34,535.52
  5. Step 5: Solve for x
    x = 34,535.52/166.20
  6. Step 6: Final answer
    x = 207.79

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.