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Finding the Fourth Proportional to 56.31, 77.67 and 39.96

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Solution

The fourth proportional to 56.31, 77.67 and 39.96 is: 55.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.31 : 77.67 = 39.96 : x
  2. Step 2: Convert to fraction form
    56.31/77.67 = 39.96/x
  3. Step 3: Cross multiply
    56.31x = 77.67 × 39.96
  4. Step 4: Simplify right side
    56.31x = 3,103.69
  5. Step 5: Solve for x
    x = 3,103.69/56.31
  6. Step 6: Final answer
    x = 55.12

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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.