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Finding the Fourth Proportional to 47.90, 66.13 and 38.69

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Solution

The fourth proportional to 47.90, 66.13 and 38.69 is: 53.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.90 : 66.13 = 38.69 : x
  2. Step 2: Convert to fraction form
    47.90/66.13 = 38.69/x
  3. Step 3: Cross multiply
    47.90x = 66.13 × 38.69
  4. Step 4: Simplify right side
    47.90x = 2,558.64
  5. Step 5: Solve for x
    x = 2,558.64/47.90
  6. Step 6: Final answer
    x = 53.42

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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.