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Finding the Fourth Proportional to 285.98, 429.05 and 217.64

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Solution

The fourth proportional to 285.98, 429.05 and 217.64 is: 326.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.98 : 429.05 = 217.64 : x
  2. Step 2: Convert to fraction form
    285.98/429.05 = 217.64/x
  3. Step 3: Cross multiply
    285.98x = 429.05 × 217.64
  4. Step 4: Simplify right side
    285.98x = 93,376.42
  5. Step 5: Solve for x
    x = 93,376.42/285.98
  6. Step 6: Final answer
    x = 326.51

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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.