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Finding the Fourth Proportional to 121.23, 181.50 and 98.45

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Solution

The fourth proportional to 121.23, 181.50 and 98.45 is: 147.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.23 : 181.50 = 98.45 : x
  2. Step 2: Convert to fraction form
    121.23/181.50 = 98.45/x
  3. Step 3: Cross multiply
    121.23x = 181.50 × 98.45
  4. Step 4: Simplify right side
    121.23x = 17,868.68
  5. Step 5: Solve for x
    x = 17,868.68/121.23
  6. Step 6: Final answer
    x = 147.39

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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.