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Finding the Fourth Proportional to 131.84, 197.81 and 66.86

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Solution

The fourth proportional to 131.84, 197.81 and 66.86 is: 100.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.84 : 197.81 = 66.86 : x
  2. Step 2: Convert to fraction form
    131.84/197.81 = 66.86/x
  3. Step 3: Cross multiply
    131.84x = 197.81 × 66.86
  4. Step 4: Simplify right side
    131.84x = 13,225.58
  5. Step 5: Solve for x
    x = 13,225.58/131.84
  6. Step 6: Final answer
    x = 100.32

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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.