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Finding the Fourth Proportional to 201.39, 278.05 and 154.68

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Solution

The fourth proportional to 201.39, 278.05 and 154.68 is: 213.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.39 : 278.05 = 154.68 : x
  2. Step 2: Convert to fraction form
    201.39/278.05 = 154.68/x
  3. Step 3: Cross multiply
    201.39x = 278.05 × 154.68
  4. Step 4: Simplify right side
    201.39x = 43,009.17
  5. Step 5: Solve for x
    x = 43,009.17/201.39
  6. Step 6: Final answer
    x = 213.56

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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.