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Finding the Fourth Proportional to 121.15, 181.54 and 75.42

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Solution

The fourth proportional to 121.15, 181.54 and 75.42 is: 113.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.15 : 181.54 = 75.42 : x
  2. Step 2: Convert to fraction form
    121.15/181.54 = 75.42/x
  3. Step 3: Cross multiply
    121.15x = 181.54 × 75.42
  4. Step 4: Simplify right side
    121.15x = 13,691.75
  5. Step 5: Solve for x
    x = 13,691.75/121.15
  6. Step 6: Final answer
    x = 113.01

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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.