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Finding the Fourth Proportional to 115.36, 172.19 and 103.18

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Solution

The fourth proportional to 115.36, 172.19 and 103.18 is: 154.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.36 : 172.19 = 103.18 : x
  2. Step 2: Convert to fraction form
    115.36/172.19 = 103.18/x
  3. Step 3: Cross multiply
    115.36x = 172.19 × 103.18
  4. Step 4: Simplify right side
    115.36x = 17,766.56
  5. Step 5: Solve for x
    x = 17,766.56/115.36
  6. Step 6: Final answer
    x = 154.01

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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.