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Finding the Fourth Proportional to 201.90, 278.76 and 155.19

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Solution

The fourth proportional to 201.90, 278.76 and 155.19 is: 214.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.90 : 278.76 = 155.19 : x
  2. Step 2: Convert to fraction form
    201.90/278.76 = 155.19/x
  3. Step 3: Cross multiply
    201.90x = 278.76 × 155.19
  4. Step 4: Simplify right side
    201.90x = 43,260.76
  5. Step 5: Solve for x
    x = 43,260.76/201.90
  6. Step 6: Final answer
    x = 214.27

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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.