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Finding the Fourth Proportional to 394.79, 544.80 and 217.76

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Solution

The fourth proportional to 394.79, 544.80 and 217.76 is: 300.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.79 : 544.80 = 217.76 : x
  2. Step 2: Convert to fraction form
    394.79/544.80 = 217.76/x
  3. Step 3: Cross multiply
    394.79x = 544.80 × 217.76
  4. Step 4: Simplify right side
    394.79x = 118,636.42
  5. Step 5: Solve for x
    x = 118,636.42/394.79
  6. Step 6: Final answer
    x = 300.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.