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Finding the Fourth Proportional to 115.20, 172.79 and 29.70

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Solution

The fourth proportional to 115.20, 172.79 and 29.70 is: 44.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.20 : 172.79 = 29.70 : x
  2. Step 2: Convert to fraction form
    115.20/172.79 = 29.70/x
  3. Step 3: Cross multiply
    115.20x = 172.79 × 29.70
  4. Step 4: Simplify right side
    115.20x = 5,131.94
  5. Step 5: Solve for x
    x = 5,131.94/115.20
  6. Step 6: Final answer
    x = 44.55

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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.