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Finding the Fourth Proportional to 131.55, 197.18 and 66.45

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Solution

The fourth proportional to 131.55, 197.18 and 66.45 is: 99.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.55 : 197.18 = 66.45 : x
  2. Step 2: Convert to fraction form
    131.55/197.18 = 66.45/x
  3. Step 3: Cross multiply
    131.55x = 197.18 × 66.45
  4. Step 4: Simplify right side
    131.55x = 13,103.27
  5. Step 5: Solve for x
    x = 13,103.27/131.55
  6. Step 6: Final answer
    x = 99.61

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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.