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Finding the Fourth Proportional to 131.83, 197.60 and 86.21

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Solution

The fourth proportional to 131.83, 197.60 and 86.21 is: 129.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.83 : 197.60 = 86.21 : x
  2. Step 2: Convert to fraction form
    131.83/197.60 = 86.21/x
  3. Step 3: Cross multiply
    131.83x = 197.60 × 86.21
  4. Step 4: Simplify right side
    131.83x = 17,035.10
  5. Step 5: Solve for x
    x = 17,035.10/131.83
  6. Step 6: Final answer
    x = 129.22

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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.