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Finding the Fourth Proportional to 239.64, 330.90 and 225.12

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Solution

The fourth proportional to 239.64, 330.90 and 225.12 is: 310.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.64 : 330.90 = 225.12 : x
  2. Step 2: Convert to fraction form
    239.64/330.90 = 225.12/x
  3. Step 3: Cross multiply
    239.64x = 330.90 × 225.12
  4. Step 4: Simplify right side
    239.64x = 74,492.21
  5. Step 5: Solve for x
    x = 74,492.21/239.64
  6. Step 6: Final answer
    x = 310.85

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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.