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Finding the Fourth Proportional to 394.40, 544.08 and 228.60

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Solution

The fourth proportional to 394.40, 544.08 and 228.60 is: 315.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.40 : 544.08 = 228.60 : x
  2. Step 2: Convert to fraction form
    394.40/544.08 = 228.60/x
  3. Step 3: Cross multiply
    394.40x = 544.08 × 228.60
  4. Step 4: Simplify right side
    394.40x = 124,376.69
  5. Step 5: Solve for x
    x = 124,376.69/394.40
  6. Step 6: Final answer
    x = 315.36

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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.