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Finding the Fourth Proportional to 386.64, 577.08 and 331.56

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Solution

The fourth proportional to 386.64, 577.08 and 331.56 is: 494.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.64 : 577.08 = 331.56 : x
  2. Step 2: Convert to fraction form
    386.64/577.08 = 331.56/x
  3. Step 3: Cross multiply
    386.64x = 577.08 × 331.56
  4. Step 4: Simplify right side
    386.64x = 191,336.64
  5. Step 5: Solve for x
    x = 191,336.64/386.64
  6. Step 6: Final answer
    x = 494.87

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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.