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Finding the Fourth Proportional to 115.48, 172.40 and 111.16

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Solution

The fourth proportional to 115.48, 172.40 and 111.16 is: 165.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.48 : 172.40 = 111.16 : x
  2. Step 2: Convert to fraction form
    115.48/172.40 = 111.16/x
  3. Step 3: Cross multiply
    115.48x = 172.40 × 111.16
  4. Step 4: Simplify right side
    115.48x = 19,163.98
  5. Step 5: Solve for x
    x = 19,163.98/115.48
  6. Step 6: Final answer
    x = 165.95

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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.