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Finding the Fourth Proportional to 643.31, 964.95 and 156.36

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Solution

The fourth proportional to 643.31, 964.95 and 156.36 is: 234.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.31 : 964.95 = 156.36 : x
  2. Step 2: Convert to fraction form
    643.31/964.95 = 156.36/x
  3. Step 3: Cross multiply
    643.31x = 964.95 × 156.36
  4. Step 4: Simplify right side
    643.31x = 150,883.93
  5. Step 5: Solve for x
    x = 150,883.93/643.31
  6. Step 6: Final answer
    x = 234.54

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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.