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Finding the Fourth Proportional to 312.11, 430.89 and 201.75

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Solution

The fourth proportional to 312.11, 430.89 and 201.75 is: 278.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.11 : 430.89 = 201.75 : x
  2. Step 2: Convert to fraction form
    312.11/430.89 = 201.75/x
  3. Step 3: Cross multiply
    312.11x = 430.89 × 201.75
  4. Step 4: Simplify right side
    312.11x = 86,932.06
  5. Step 5: Solve for x
    x = 86,932.06/312.11
  6. Step 6: Final answer
    x = 278.53

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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.