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Finding the Fourth Proportional to 201.78, 278.64 and 158.31

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Solution

The fourth proportional to 201.78, 278.64 and 158.31 is: 218.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.78 : 278.64 = 158.31 : x
  2. Step 2: Convert to fraction form
    201.78/278.64 = 158.31/x
  3. Step 3: Cross multiply
    201.78x = 278.64 × 158.31
  4. Step 4: Simplify right side
    201.78x = 44,111.50
  5. Step 5: Solve for x
    x = 44,111.50/201.78
  6. Step 6: Final answer
    x = 218.61

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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.