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Finding the Fourth Proportional to 306.75, 423.02 and 201.81

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Solution

The fourth proportional to 306.75, 423.02 and 201.81 is: 278.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.75 : 423.02 = 201.81 : x
  2. Step 2: Convert to fraction form
    306.75/423.02 = 201.81/x
  3. Step 3: Cross multiply
    306.75x = 423.02 × 201.81
  4. Step 4: Simplify right side
    306.75x = 85,368.66
  5. Step 5: Solve for x
    x = 85,368.66/306.75
  6. Step 6: Final answer
    x = 278.30

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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.