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Finding the Fourth Proportional to 47.98, 66 and 40.60

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Solution

The fourth proportional to 47.98, 66 and 40.60 is: 55.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.98 : 66 = 40.60 : x
  2. Step 2: Convert to fraction form
    47.98/66 = 40.60/x
  3. Step 3: Cross multiply
    47.98x = 66 × 40.60
  4. Step 4: Simplify right side
    47.98x = 2,679.60
  5. Step 5: Solve for x
    x = 2,679.60/47.98
  6. Step 6: Final answer
    x = 55.85

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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.