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Finding the Fourth Proportional to 287.31, 396.50 and 163.00

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Solution

The fourth proportional to 287.31, 396.50 and 163.00 is: 224.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.31 : 396.50 = 163.00 : x
  2. Step 2: Convert to fraction form
    287.31/396.50 = 163.00/x
  3. Step 3: Cross multiply
    287.31x = 396.50 × 163.00
  4. Step 4: Simplify right side
    287.31x = 64,629.18
  5. Step 5: Solve for x
    x = 64,629.18/287.31
  6. Step 6: Final answer
    x = 224.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.