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Finding the Fourth Proportional to 642.40, 963.32 and 231.46

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Solution

The fourth proportional to 642.40, 963.32 and 231.46 is: 347.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.40 : 963.32 = 231.46 : x
  2. Step 2: Convert to fraction form
    642.40/963.32 = 231.46/x
  3. Step 3: Cross multiply
    642.40x = 963.32 × 231.46
  4. Step 4: Simplify right side
    642.40x = 222,970.05
  5. Step 5: Solve for x
    x = 222,970.05/642.40
  6. Step 6: Final answer
    x = 347.09

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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.