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Finding the Fourth Proportional to 306.12, 422.32 and 189.64

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Solution

The fourth proportional to 306.12, 422.32 and 189.64 is: 261.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.12 : 422.32 = 189.64 : x
  2. Step 2: Convert to fraction form
    306.12/422.32 = 189.64/x
  3. Step 3: Cross multiply
    306.12x = 422.32 × 189.64
  4. Step 4: Simplify right side
    306.12x = 80,088.76
  5. Step 5: Solve for x
    x = 80,088.76/306.12
  6. Step 6: Final answer
    x = 261.63

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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.