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Finding the Fourth Proportional to 131.78, 197.67 and 77.63

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Solution

The fourth proportional to 131.78, 197.67 and 77.63 is: 116.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.78 : 197.67 = 77.63 : x
  2. Step 2: Convert to fraction form
    131.78/197.67 = 77.63/x
  3. Step 3: Cross multiply
    131.78x = 197.67 × 77.63
  4. Step 4: Simplify right side
    131.78x = 15,344.73
  5. Step 5: Solve for x
    x = 15,344.73/131.78
  6. Step 6: Final answer
    x = 116.45

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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.