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Finding the Fourth Proportional to 115.55, 172.08 and 108.56

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Solution

The fourth proportional to 115.55, 172.08 and 108.56 is: 161.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.55 : 172.08 = 108.56 : x
  2. Step 2: Convert to fraction form
    115.55/172.08 = 108.56/x
  3. Step 3: Cross multiply
    115.55x = 172.08 × 108.56
  4. Step 4: Simplify right side
    115.55x = 18,681.44
  5. Step 5: Solve for x
    x = 18,681.44/115.55
  6. Step 6: Final answer
    x = 161.68

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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.