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Finding the Fourth Proportional to 180.98, 249.85 and 139.45

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Solution

The fourth proportional to 180.98, 249.85 and 139.45 is: 192.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.98 : 249.85 = 139.45 : x
  2. Step 2: Convert to fraction form
    180.98/249.85 = 139.45/x
  3. Step 3: Cross multiply
    180.98x = 249.85 × 139.45
  4. Step 4: Simplify right side
    180.98x = 34,840.33
  5. Step 5: Solve for x
    x = 34,840.33/180.98
  6. Step 6: Final answer
    x = 192.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.