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Finding the Fourth Proportional to 131.78, 197.67 and 45.12

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Solution

The fourth proportional to 131.78, 197.67 and 45.12 is: 67.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.78 : 197.67 = 45.12 : x
  2. Step 2: Convert to fraction form
    131.78/197.67 = 45.12/x
  3. Step 3: Cross multiply
    131.78x = 197.67 × 45.12
  4. Step 4: Simplify right side
    131.78x = 8,918.87
  5. Step 5: Solve for x
    x = 8,918.87/131.78
  6. Step 6: Final answer
    x = 67.68

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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.