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Finding the Fourth Proportional to 286.36, 429.78 and 113.15

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Solution

The fourth proportional to 286.36, 429.78 and 113.15 is: 169.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.36 : 429.78 = 113.15 : x
  2. Step 2: Convert to fraction form
    286.36/429.78 = 113.15/x
  3. Step 3: Cross multiply
    286.36x = 429.78 × 113.15
  4. Step 4: Simplify right side
    286.36x = 48,627.03
  5. Step 5: Solve for x
    x = 48,627.03/286.36
  6. Step 6: Final answer
    x = 169.81

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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.