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Finding the Fourth Proportional to 306.87, 423.54 and 201.78

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Solution

The fourth proportional to 306.87, 423.54 and 201.78 is: 278.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.87 : 423.54 = 201.78 : x
  2. Step 2: Convert to fraction form
    306.87/423.54 = 201.78/x
  3. Step 3: Cross multiply
    306.87x = 423.54 × 201.78
  4. Step 4: Simplify right side
    306.87x = 85,459.78
  5. Step 5: Solve for x
    x = 85,459.78/306.87
  6. Step 6: Final answer
    x = 278.49

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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.