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Finding the Fourth Proportional to 289.32, 399.33 and 219.57

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Solution

The fourth proportional to 289.32, 399.33 and 219.57 is: 303.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.32 : 399.33 = 219.57 : x
  2. Step 2: Convert to fraction form
    289.32/399.33 = 219.57/x
  3. Step 3: Cross multiply
    289.32x = 399.33 × 219.57
  4. Step 4: Simplify right side
    289.32x = 87,680.89
  5. Step 5: Solve for x
    x = 87,680.89/289.32
  6. Step 6: Final answer
    x = 303.06

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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.