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Finding the Fourth Proportional to 384.31, 576.56 and 140.89

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Solution

The fourth proportional to 384.31, 576.56 and 140.89 is: 211.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.31 : 576.56 = 140.89 : x
  2. Step 2: Convert to fraction form
    384.31/576.56 = 140.89/x
  3. Step 3: Cross multiply
    384.31x = 576.56 × 140.89
  4. Step 4: Simplify right side
    384.31x = 81,230.83
  5. Step 5: Solve for x
    x = 81,230.83/384.31
  6. Step 6: Final answer
    x = 211.37

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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.