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Finding the Fourth Proportional to 47.09, 65.05 and 39.38

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Solution

The fourth proportional to 47.09, 65.05 and 39.38 is: 54.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.09 : 65.05 = 39.38 : x
  2. Step 2: Convert to fraction form
    47.09/65.05 = 39.38/x
  3. Step 3: Cross multiply
    47.09x = 65.05 × 39.38
  4. Step 4: Simplify right side
    47.09x = 2,561.25
  5. Step 5: Solve for x
    x = 2,561.25/47.09
  6. Step 6: Final answer
    x = 54.39

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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.