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Finding the Fourth Proportional to 163.71, 245.43 and 81.50

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Solution

The fourth proportional to 163.71, 245.43 and 81.50 is: 122.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.71 : 245.43 = 81.50 : x
  2. Step 2: Convert to fraction form
    163.71/245.43 = 81.50/x
  3. Step 3: Cross multiply
    163.71x = 245.43 × 81.50
  4. Step 4: Simplify right side
    163.71x = 20,001.32
  5. Step 5: Solve for x
    x = 20,001.32/163.71
  6. Step 6: Final answer
    x = 122.18

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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.