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Finding the Fourth Proportional to 105.87, 158.88 and 81.98

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Solution

The fourth proportional to 105.87, 158.88 and 81.98 is: 123.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.87 : 158.88 = 81.98 : x
  2. Step 2: Convert to fraction form
    105.87/158.88 = 81.98/x
  3. Step 3: Cross multiply
    105.87x = 158.88 × 81.98
  4. Step 4: Simplify right side
    105.87x = 13,024.63
  5. Step 5: Solve for x
    x = 13,024.63/105.87
  6. Step 6: Final answer
    x = 123.02

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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.