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Finding the Fourth Proportional to 115.05, 172.36 and 46.54

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Solution

The fourth proportional to 115.05, 172.36 and 46.54 is: 69.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.05 : 172.36 = 46.54 : x
  2. Step 2: Convert to fraction form
    115.05/172.36 = 46.54/x
  3. Step 3: Cross multiply
    115.05x = 172.36 × 46.54
  4. Step 4: Simplify right side
    115.05x = 8,021.63
  5. Step 5: Solve for x
    x = 8,021.63/115.05
  6. Step 6: Final answer
    x = 69.72

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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.