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Finding the Fourth Proportional to 306.21, 459.13 and 121.17

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Solution

The fourth proportional to 306.21, 459.13 and 121.17 is: 181.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.21 : 459.13 = 121.17 : x
  2. Step 2: Convert to fraction form
    306.21/459.13 = 121.17/x
  3. Step 3: Cross multiply
    306.21x = 459.13 × 121.17
  4. Step 4: Simplify right side
    306.21x = 55,632.78
  5. Step 5: Solve for x
    x = 55,632.78/306.21
  6. Step 6: Final answer
    x = 181.68

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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.