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Finding the Fourth Proportional to 55, 81.96 and 51.90

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Solution

The fourth proportional to 55, 81.96 and 51.90 is: 77.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    55 : 81.96 = 51.90 : x
  2. Step 2: Convert to fraction form
    55/81.96 = 51.90/x
  3. Step 3: Cross multiply
    55x = 81.96 × 51.90
  4. Step 4: Simplify right side
    55x = 4,253.72
  5. Step 5: Solve for x
    x = 4,253.72/55
  6. Step 6: Final answer
    x = 77.34

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.