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Finding the Fourth Proportional to 394.56, 587.48 and 388.72

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Solution

The fourth proportional to 394.56, 587.48 and 388.72 is: 578.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.56 : 587.48 = 388.72 : x
  2. Step 2: Convert to fraction form
    394.56/587.48 = 388.72/x
  3. Step 3: Cross multiply
    394.56x = 587.48 × 388.72
  4. Step 4: Simplify right side
    394.56x = 228,365.23
  5. Step 5: Solve for x
    x = 228,365.23/394.56
  6. Step 6: Final answer
    x = 578.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.