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Finding the Fourth Proportional to 115.38, 172.40 and 94.86

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Solution

The fourth proportional to 115.38, 172.40 and 94.86 is: 141.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.38 : 172.40 = 94.86 : x
  2. Step 2: Convert to fraction form
    115.38/172.40 = 94.86/x
  3. Step 3: Cross multiply
    115.38x = 172.40 × 94.86
  4. Step 4: Simplify right side
    115.38x = 16,353.39
  5. Step 5: Solve for x
    x = 16,353.39/115.38
  6. Step 6: Final answer
    x = 141.74

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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.