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Finding the Fourth Proportional to 115.53, 172.89 and 105.40

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Solution

The fourth proportional to 115.53, 172.89 and 105.40 is: 157.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.53 : 172.89 = 105.40 : x
  2. Step 2: Convert to fraction form
    115.53/172.89 = 105.40/x
  3. Step 3: Cross multiply
    115.53x = 172.89 × 105.40
  4. Step 4: Simplify right side
    115.53x = 18,222.61
  5. Step 5: Solve for x
    x = 18,222.61/115.53
  6. Step 6: Final answer
    x = 157.73

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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.