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Finding the Fourth Proportional to 201.83, 278.21 and 131.87

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Solution

The fourth proportional to 201.83, 278.21 and 131.87 is: 181.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.83 : 278.21 = 131.87 : x
  2. Step 2: Convert to fraction form
    201.83/278.21 = 131.87/x
  3. Step 3: Cross multiply
    201.83x = 278.21 × 131.87
  4. Step 4: Simplify right side
    201.83x = 36,688.58
  5. Step 5: Solve for x
    x = 36,688.58/201.83
  6. Step 6: Final answer
    x = 181.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.