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Finding the Fourth Proportional to 115.20, 172.68 and 61.14

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Solution

The fourth proportional to 115.20, 172.68 and 61.14 is: 91.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.20 : 172.68 = 61.14 : x
  2. Step 2: Convert to fraction form
    115.20/172.68 = 61.14/x
  3. Step 3: Cross multiply
    115.20x = 172.68 × 61.14
  4. Step 4: Simplify right side
    115.20x = 10,557.66
  5. Step 5: Solve for x
    x = 10,557.66/115.20
  6. Step 6: Final answer
    x = 91.65

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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.