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Finding the Fourth Proportional to 286.66, 429.90 and 142.48

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Solution

The fourth proportional to 286.66, 429.90 and 142.48 is: 213.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.66 : 429.90 = 142.48 : x
  2. Step 2: Convert to fraction form
    286.66/429.90 = 142.48/x
  3. Step 3: Cross multiply
    286.66x = 429.90 × 142.48
  4. Step 4: Simplify right side
    286.66x = 61,252.15
  5. Step 5: Solve for x
    x = 61,252.15/286.66
  6. Step 6: Final answer
    x = 213.68

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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.