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Finding the Fourth Proportional to 115.46, 172.10 and 109.68

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Solution

The fourth proportional to 115.46, 172.10 and 109.68 is: 163.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.46 : 172.10 = 109.68 : x
  2. Step 2: Convert to fraction form
    115.46/172.10 = 109.68/x
  3. Step 3: Cross multiply
    115.46x = 172.10 × 109.68
  4. Step 4: Simplify right side
    115.46x = 18,875.38
  5. Step 5: Solve for x
    x = 18,875.38/115.46
  6. Step 6: Final answer
    x = 163.49

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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.