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Finding the Fourth Proportional to 201.20, 277.80 and 143.06

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Solution

The fourth proportional to 201.20, 277.80 and 143.06 is: 197.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.20 : 277.80 = 143.06 : x
  2. Step 2: Convert to fraction form
    201.20/277.80 = 143.06/x
  3. Step 3: Cross multiply
    201.20x = 277.80 × 143.06
  4. Step 4: Simplify right side
    201.20x = 39,742.07
  5. Step 5: Solve for x
    x = 39,742.07/201.20
  6. Step 6: Final answer
    x = 197.53

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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.