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Finding the Fourth Proportional to 286.18, 428.61 and 248.64

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Solution

The fourth proportional to 286.18, 428.61 and 248.64 is: 372.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.18 : 428.61 = 248.64 : x
  2. Step 2: Convert to fraction form
    286.18/428.61 = 248.64/x
  3. Step 3: Cross multiply
    286.18x = 428.61 × 248.64
  4. Step 4: Simplify right side
    286.18x = 106,569.59
  5. Step 5: Solve for x
    x = 106,569.59/286.18
  6. Step 6: Final answer
    x = 372.39

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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.