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Finding the Fourth Proportional to 131.82, 197.76 and 45.15

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Solution

The fourth proportional to 131.82, 197.76 and 45.15 is: 67.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.82 : 197.76 = 45.15 : x
  2. Step 2: Convert to fraction form
    131.82/197.76 = 45.15/x
  3. Step 3: Cross multiply
    131.82x = 197.76 × 45.15
  4. Step 4: Simplify right side
    131.82x = 8,928.86
  5. Step 5: Solve for x
    x = 8,928.86/131.82
  6. Step 6: Final answer
    x = 67.74

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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.