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Finding the Fourth Proportional to 201.96, 278.80 and 128.31

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Solution

The fourth proportional to 201.96, 278.80 and 128.31 is: 177.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.96 : 278.80 = 128.31 : x
  2. Step 2: Convert to fraction form
    201.96/278.80 = 128.31/x
  3. Step 3: Cross multiply
    201.96x = 278.80 × 128.31
  4. Step 4: Simplify right side
    201.96x = 35,772.83
  5. Step 5: Solve for x
    x = 35,772.83/201.96
  6. Step 6: Final answer
    x = 177.13

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