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Finding the Fourth Proportional to 115.17, 171.80 and 106.56

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Solution

The fourth proportional to 115.17, 171.80 and 106.56 is: 158.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.17 : 171.80 = 106.56 : x
  2. Step 2: Convert to fraction form
    115.17/171.80 = 106.56/x
  3. Step 3: Cross multiply
    115.17x = 171.80 × 106.56
  4. Step 4: Simplify right side
    115.17x = 18,307.01
  5. Step 5: Solve for x
    x = 18,307.01/115.17
  6. Step 6: Final answer
    x = 158.96

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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.