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Finding the Fourth Proportional to 180.19, 248.87 and 121.87

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Solution

The fourth proportional to 180.19, 248.87 and 121.87 is: 168.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.19 : 248.87 = 121.87 : x
  2. Step 2: Convert to fraction form
    180.19/248.87 = 121.87/x
  3. Step 3: Cross multiply
    180.19x = 248.87 × 121.87
  4. Step 4: Simplify right side
    180.19x = 30,328.56
  5. Step 5: Solve for x
    x = 30,328.56/180.19
  6. Step 6: Final answer
    x = 168.32

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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.