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Finding the Fourth Proportional to 115.28, 172 and 109.20

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Solution

The fourth proportional to 115.28, 172 and 109.20 is: 162.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.28 : 172 = 109.20 : x
  2. Step 2: Convert to fraction form
    115.28/172 = 109.20/x
  3. Step 3: Cross multiply
    115.28x = 172 × 109.20
  4. Step 4: Simplify right side
    115.28x = 18,782.40
  5. Step 5: Solve for x
    x = 18,782.40/115.28
  6. Step 6: Final answer
    x = 162.93

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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.