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Finding the Fourth Proportional to 607.79, 911.57 and 217.78

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Solution

The fourth proportional to 607.79, 911.57 and 217.78 is: 326.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    607.79 : 911.57 = 217.78 : x
  2. Step 2: Convert to fraction form
    607.79/911.57 = 217.78/x
  3. Step 3: Cross multiply
    607.79x = 911.57 × 217.78
  4. Step 4: Simplify right side
    607.79x = 198,521.71
  5. Step 5: Solve for x
    x = 198,521.71/607.79
  6. Step 6: Final answer
    x = 326.63

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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.