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Finding the Fourth Proportional to 105.98, 158.87 and 51.12

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Solution

The fourth proportional to 105.98, 158.87 and 51.12 is: 76.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.98 : 158.87 = 51.12 : x
  2. Step 2: Convert to fraction form
    105.98/158.87 = 51.12/x
  3. Step 3: Cross multiply
    105.98x = 158.87 × 51.12
  4. Step 4: Simplify right side
    105.98x = 8,121.18
  5. Step 5: Solve for x
    x = 8,121.18/105.98
  6. Step 6: Final answer
    x = 76.63

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.