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Finding the Fourth Proportional to 163.30, 243.28 and 155.56

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Solution

The fourth proportional to 163.30, 243.28 and 155.56 is: 231.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.30 : 243.28 = 155.56 : x
  2. Step 2: Convert to fraction form
    163.30/243.28 = 155.56/x
  3. Step 3: Cross multiply
    163.30x = 243.28 × 155.56
  4. Step 4: Simplify right side
    163.30x = 37,844.64
  5. Step 5: Solve for x
    x = 37,844.64/163.30
  6. Step 6: Final answer
    x = 231.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.