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Finding the Fourth Proportional to 163.74, 245.78 and 72.51

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Solution

The fourth proportional to 163.74, 245.78 and 72.51 is: 108.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.74 : 245.78 = 72.51 : x
  2. Step 2: Convert to fraction form
    163.74/245.78 = 72.51/x
  3. Step 3: Cross multiply
    163.74x = 245.78 × 72.51
  4. Step 4: Simplify right side
    163.74x = 17,822.29
  5. Step 5: Solve for x
    x = 17,822.29/163.74
  6. Step 6: Final answer
    x = 108.85

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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.