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Finding the Fourth Proportional to 163.89, 245.70 and 72.45

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Solution

The fourth proportional to 163.89, 245.70 and 72.45 is: 108.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.89 : 245.70 = 72.45 : x
  2. Step 2: Convert to fraction form
    163.89/245.70 = 72.45/x
  3. Step 3: Cross multiply
    163.89x = 245.70 × 72.45
  4. Step 4: Simplify right side
    163.89x = 17,800.97
  5. Step 5: Solve for x
    x = 17,800.97/163.89
  6. Step 6: Final answer
    x = 108.62

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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.