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Finding the Fourth Proportional to 386.60, 576.88 and 331.72

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Solution

The fourth proportional to 386.60, 576.88 and 331.72 is: 494.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.60 : 576.88 = 331.72 : x
  2. Step 2: Convert to fraction form
    386.60/576.88 = 331.72/x
  3. Step 3: Cross multiply
    386.60x = 576.88 × 331.72
  4. Step 4: Simplify right side
    386.60x = 191,360.36
  5. Step 5: Solve for x
    x = 191,360.36/386.60
  6. Step 6: Final answer
    x = 494.99

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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.