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Finding the Fourth Proportional to 105.12, 157.94 and 85.98

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Solution

The fourth proportional to 105.12, 157.94 and 85.98 is: 129.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.12 : 157.94 = 85.98 : x
  2. Step 2: Convert to fraction form
    105.12/157.94 = 85.98/x
  3. Step 3: Cross multiply
    105.12x = 157.94 × 85.98
  4. Step 4: Simplify right side
    105.12x = 13,579.84
  5. Step 5: Solve for x
    x = 13,579.84/105.12
  6. Step 6: Final answer
    x = 129.18

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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.