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Finding the Fourth Proportional to 105.88, 145.96 and 86.16

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Solution

The fourth proportional to 105.88, 145.96 and 86.16 is: 118.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.88 : 145.96 = 86.16 : x
  2. Step 2: Convert to fraction form
    105.88/145.96 = 86.16/x
  3. Step 3: Cross multiply
    105.88x = 145.96 × 86.16
  4. Step 4: Simplify right side
    105.88x = 12,575.91
  5. Step 5: Solve for x
    x = 12,575.91/105.88
  6. Step 6: Final answer
    x = 118.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.