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Finding the Fourth Proportional to 131.80, 197.69 and 45.13

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Solution

The fourth proportional to 131.80, 197.69 and 45.13 is: 67.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.80 : 197.69 = 45.13 : x
  2. Step 2: Convert to fraction form
    131.80/197.69 = 45.13/x
  3. Step 3: Cross multiply
    131.80x = 197.69 × 45.13
  4. Step 4: Simplify right side
    131.80x = 8,921.75
  5. Step 5: Solve for x
    x = 8,921.75/131.80
  6. Step 6: Final answer
    x = 67.69

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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.