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Finding the Fourth Proportional to 286.37, 429.18 and 217.68

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Solution

The fourth proportional to 286.37, 429.18 and 217.68 is: 326.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.37 : 429.18 = 217.68 : x
  2. Step 2: Convert to fraction form
    286.37/429.18 = 217.68/x
  3. Step 3: Cross multiply
    286.37x = 429.18 × 217.68
  4. Step 4: Simplify right side
    286.37x = 93,423.90
  5. Step 5: Solve for x
    x = 93,423.90/286.37
  6. Step 6: Final answer
    x = 326.24

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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.