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Finding the Fourth Proportional to 201.67, 278.30 and 113.15

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Solution

The fourth proportional to 201.67, 278.30 and 113.15 is: 156.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.67 : 278.30 = 113.15 : x
  2. Step 2: Convert to fraction form
    201.67/278.30 = 113.15/x
  3. Step 3: Cross multiply
    201.67x = 278.30 × 113.15
  4. Step 4: Simplify right side
    201.67x = 31,489.65
  5. Step 5: Solve for x
    x = 31,489.65/201.67
  6. Step 6: Final answer
    x = 156.14

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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.