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Finding the Fourth Proportional to 47.81, 66.05 and 37.99

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Solution

The fourth proportional to 47.81, 66.05 and 37.99 is: 52.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.81 : 66.05 = 37.99 : x
  2. Step 2: Convert to fraction form
    47.81/66.05 = 37.99/x
  3. Step 3: Cross multiply
    47.81x = 66.05 × 37.99
  4. Step 4: Simplify right side
    47.81x = 2,509.24
  5. Step 5: Solve for x
    x = 2,509.24/47.81
  6. Step 6: Final answer
    x = 52.48

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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.