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Finding the Fourth Proportional to 381.17, 571.55 and 121.11

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Solution

The fourth proportional to 381.17, 571.55 and 121.11 is: 181.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.17 : 571.55 = 121.11 : x
  2. Step 2: Convert to fraction form
    381.17/571.55 = 121.11/x
  3. Step 3: Cross multiply
    381.17x = 571.55 × 121.11
  4. Step 4: Simplify right side
    381.17x = 69,219.81
  5. Step 5: Solve for x
    x = 69,219.81/381.17
  6. Step 6: Final answer
    x = 181.60

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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.