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Finding the Fourth Proportional to 47.78, 65.97 and 30.30

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Solution

The fourth proportional to 47.78, 65.97 and 30.30 is: 41.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.78 : 65.97 = 30.30 : x
  2. Step 2: Convert to fraction form
    47.78/65.97 = 30.30/x
  3. Step 3: Cross multiply
    47.78x = 65.97 × 30.30
  4. Step 4: Simplify right side
    47.78x = 1,998.78
  5. Step 5: Solve for x
    x = 1,998.78/47.78
  6. Step 6: Final answer
    x = 41.83

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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.