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Finding the Fourth Proportional to 201.47, 278.05 and 114.15

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Solution

The fourth proportional to 201.47, 278.05 and 114.15 is: 157.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.47 : 278.05 = 114.15 : x
  2. Step 2: Convert to fraction form
    201.47/278.05 = 114.15/x
  3. Step 3: Cross multiply
    201.47x = 278.05 × 114.15
  4. Step 4: Simplify right side
    201.47x = 31,739.53
  5. Step 5: Solve for x
    x = 31,739.53/201.47
  6. Step 6: Final answer
    x = 157.54

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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.