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Finding the Fourth Proportional to 306.60, 423.12 and 201.72

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Solution

The fourth proportional to 306.60, 423.12 and 201.72 is: 278.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.60 : 423.12 = 201.72 : x
  2. Step 2: Convert to fraction form
    306.60/423.12 = 201.72/x
  3. Step 3: Cross multiply
    306.60x = 423.12 × 201.72
  4. Step 4: Simplify right side
    306.60x = 85,351.77
  5. Step 5: Solve for x
    x = 85,351.77/306.60
  6. Step 6: Final answer
    x = 278.38

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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.