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Finding the Fourth Proportional to 394.40, 544.29 and 228.65

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Solution

The fourth proportional to 394.40, 544.29 and 228.65 is: 315.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.40 : 544.29 = 228.65 : x
  2. Step 2: Convert to fraction form
    394.40/544.29 = 228.65/x
  3. Step 3: Cross multiply
    394.40x = 544.29 × 228.65
  4. Step 4: Simplify right side
    394.40x = 124,451.91
  5. Step 5: Solve for x
    x = 124,451.91/394.40
  6. Step 6: Final answer
    x = 315.55

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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.