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Finding the Fourth Proportional to 286.38, 429.46 and 103.72

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Solution

The fourth proportional to 286.38, 429.46 and 103.72 is: 155.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.38 : 429.46 = 103.72 : x
  2. Step 2: Convert to fraction form
    286.38/429.46 = 103.72/x
  3. Step 3: Cross multiply
    286.38x = 429.46 × 103.72
  4. Step 4: Simplify right side
    286.38x = 44,543.59
  5. Step 5: Solve for x
    x = 44,543.59/286.38
  6. Step 6: Final answer
    x = 155.54

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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.