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Finding the Fourth Proportional to 384.90, 576.89 and 211.65

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Solution

The fourth proportional to 384.90, 576.89 and 211.65 is: 317.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.90 : 576.89 = 211.65 : x
  2. Step 2: Convert to fraction form
    384.90/576.89 = 211.65/x
  3. Step 3: Cross multiply
    384.90x = 576.89 × 211.65
  4. Step 4: Simplify right side
    384.90x = 122,099.30
  5. Step 5: Solve for x
    x = 122,099.30/384.90
  6. Step 6: Final answer
    x = 317.22

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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.