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Finding the Fourth Proportional to 149.49, 223.74 and 139.50

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Solution

The fourth proportional to 149.49, 223.74 and 139.50 is: 208.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.49 : 223.74 = 139.50 : x
  2. Step 2: Convert to fraction form
    149.49/223.74 = 139.50/x
  3. Step 3: Cross multiply
    149.49x = 223.74 × 139.50
  4. Step 4: Simplify right side
    149.49x = 31,211.73
  5. Step 5: Solve for x
    x = 31,211.73/149.49
  6. Step 6: Final answer
    x = 208.79

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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.