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Finding the Fourth Proportional to 69.92, 96.40 and 56.96

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Solution

The fourth proportional to 69.92, 96.40 and 56.96 is: 78.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.92 : 96.40 = 56.96 : x
  2. Step 2: Convert to fraction form
    69.92/96.40 = 56.96/x
  3. Step 3: Cross multiply
    69.92x = 96.40 × 56.96
  4. Step 4: Simplify right side
    69.92x = 5,490.94
  5. Step 5: Solve for x
    x = 5,490.94/69.92
  6. Step 6: Final answer
    x = 78.53

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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.