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Finding the Fourth Proportional to 131.72, 197.66 and 54.69

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Solution

The fourth proportional to 131.72, 197.66 and 54.69 is: 82.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.72 : 197.66 = 54.69 : x
  2. Step 2: Convert to fraction form
    131.72/197.66 = 54.69/x
  3. Step 3: Cross multiply
    131.72x = 197.66 × 54.69
  4. Step 4: Simplify right side
    131.72x = 10,810.03
  5. Step 5: Solve for x
    x = 10,810.03/131.72
  6. Step 6: Final answer
    x = 82.07

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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.