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Finding the Fourth Proportional to 47.14, 65.09 and 30.79

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Solution

The fourth proportional to 47.14, 65.09 and 30.79 is: 42.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.14 : 65.09 = 30.79 : x
  2. Step 2: Convert to fraction form
    47.14/65.09 = 30.79/x
  3. Step 3: Cross multiply
    47.14x = 65.09 × 30.79
  4. Step 4: Simplify right side
    47.14x = 2,004.12
  5. Step 5: Solve for x
    x = 2,004.12/47.14
  6. Step 6: Final answer
    x = 42.51

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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.