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Finding the Fourth Proportional to 201.90, 278.82 and 139.89

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Solution

The fourth proportional to 201.90, 278.82 and 139.89 is: 193.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.90 : 278.82 = 139.89 : x
  2. Step 2: Convert to fraction form
    201.90/278.82 = 139.89/x
  3. Step 3: Cross multiply
    201.90x = 278.82 × 139.89
  4. Step 4: Simplify right side
    201.90x = 39,004.13
  5. Step 5: Solve for x
    x = 39,004.13/201.90
  6. Step 6: Final answer
    x = 193.19

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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.