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Finding the Fourth Proportional to 76.56, 105.60 and 47.42

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Solution

The fourth proportional to 76.56, 105.60 and 47.42 is: 65.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.56 : 105.60 = 47.42 : x
  2. Step 2: Convert to fraction form
    76.56/105.60 = 47.42/x
  3. Step 3: Cross multiply
    76.56x = 105.60 × 47.42
  4. Step 4: Simplify right side
    76.56x = 5,007.55
  5. Step 5: Solve for x
    x = 5,007.55/76.56
  6. Step 6: Final answer
    x = 65.41

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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.