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Finding the Fourth Proportional to 201.55, 278.15 and 114.20

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Solution

The fourth proportional to 201.55, 278.15 and 114.20 is: 157.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.55 : 278.15 = 114.20 : x
  2. Step 2: Convert to fraction form
    201.55/278.15 = 114.20/x
  3. Step 3: Cross multiply
    201.55x = 278.15 × 114.20
  4. Step 4: Simplify right side
    201.55x = 31,764.85
  5. Step 5: Solve for x
    x = 31,764.85/201.55
  6. Step 6: Final answer
    x = 157.60

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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.