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Finding the Fourth Proportional to 51.78, 71.42 and 47.68

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Solution

The fourth proportional to 51.78, 71.42 and 47.68 is: 65.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.78 : 71.42 = 47.68 : x
  2. Step 2: Convert to fraction form
    51.78/71.42 = 47.68/x
  3. Step 3: Cross multiply
    51.78x = 71.42 × 47.68
  4. Step 4: Simplify right side
    51.78x = 3,405.31
  5. Step 5: Solve for x
    x = 3,405.31/51.78
  6. Step 6: Final answer
    x = 65.76

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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.