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Finding the Fourth Proportional to 289.99, 435.19 and 213.15

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Solution

The fourth proportional to 289.99, 435.19 and 213.15 is: 319.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.99 : 435.19 = 213.15 : x
  2. Step 2: Convert to fraction form
    289.99/435.19 = 213.15/x
  3. Step 3: Cross multiply
    289.99x = 435.19 × 213.15
  4. Step 4: Simplify right side
    289.99x = 92,760.75
  5. Step 5: Solve for x
    x = 92,760.75/289.99
  6. Step 6: Final answer
    x = 319.88

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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.