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Finding the Fourth Proportional to 105.42, 145.68 and 86.97

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Solution

The fourth proportional to 105.42, 145.68 and 86.97 is: 120.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.42 : 145.68 = 86.97 : x
  2. Step 2: Convert to fraction form
    105.42/145.68 = 86.97/x
  3. Step 3: Cross multiply
    105.42x = 145.68 × 86.97
  4. Step 4: Simplify right side
    105.42x = 12,669.79
  5. Step 5: Solve for x
    x = 12,669.79/105.42
  6. Step 6: Final answer
    x = 120.18

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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.