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Finding the Fourth Proportional to 286.61, 428.82 and 217.91

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Solution

The fourth proportional to 286.61, 428.82 and 217.91 is: 326.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.61 : 428.82 = 217.91 : x
  2. Step 2: Convert to fraction form
    286.61/428.82 = 217.91/x
  3. Step 3: Cross multiply
    286.61x = 428.82 × 217.91
  4. Step 4: Simplify right side
    286.61x = 93,444.17
  5. Step 5: Solve for x
    x = 93,444.17/286.61
  6. Step 6: Final answer
    x = 326.03

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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.