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Finding the Fourth Proportional to 394.47, 544.40 and 228.71

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Solution

The fourth proportional to 394.47, 544.40 and 228.71 is: 315.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.47 : 544.40 = 228.71 : x
  2. Step 2: Convert to fraction form
    394.47/544.40 = 228.71/x
  3. Step 3: Cross multiply
    394.47x = 544.40 × 228.71
  4. Step 4: Simplify right side
    394.47x = 124,509.02
  5. Step 5: Solve for x
    x = 124,509.02/394.47
  6. Step 6: Final answer
    x = 315.64

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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.