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Finding the Fourth Proportional to 163.53, 245.25 and 81.25

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Solution

The fourth proportional to 163.53, 245.25 and 81.25 is: 121.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.53 : 245.25 = 81.25 : x
  2. Step 2: Convert to fraction form
    163.53/245.25 = 81.25/x
  3. Step 3: Cross multiply
    163.53x = 245.25 × 81.25
  4. Step 4: Simplify right side
    163.53x = 19,925.95
  5. Step 5: Solve for x
    x = 19,925.95/163.53
  6. Step 6: Final answer
    x = 121.85

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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.