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Finding the Fourth Proportional to 105.74, 158.34 and 81.98

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Solution

The fourth proportional to 105.74, 158.34 and 81.98 is: 122.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.74 : 158.34 = 81.98 : x
  2. Step 2: Convert to fraction form
    105.74/158.34 = 81.98/x
  3. Step 3: Cross multiply
    105.74x = 158.34 × 81.98
  4. Step 4: Simplify right side
    105.74x = 12,980.71
  5. Step 5: Solve for x
    x = 12,980.71/105.74
  6. Step 6: Final answer
    x = 122.76

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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.