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Finding the Fourth Proportional to 286.91, 429.90 and 149.75

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Solution

The fourth proportional to 286.91, 429.90 and 149.75 is: 224.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.91 : 429.90 = 149.75 : x
  2. Step 2: Convert to fraction form
    286.91/429.90 = 149.75/x
  3. Step 3: Cross multiply
    286.91x = 429.90 × 149.75
  4. Step 4: Simplify right side
    286.91x = 64,378.04
  5. Step 5: Solve for x
    x = 64,378.04/286.91
  6. Step 6: Final answer
    x = 224.38

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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.