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Finding the Fourth Proportional to 386.86, 531.26 and 331.60

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Solution

The fourth proportional to 386.86, 531.26 and 331.60 is: 455.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.86 : 531.26 = 331.60 : x
  2. Step 2: Convert to fraction form
    386.86/531.26 = 331.60/x
  3. Step 3: Cross multiply
    386.86x = 531.26 × 331.60
  4. Step 4: Simplify right side
    386.86x = 176,165.82
  5. Step 5: Solve for x
    x = 176,165.82/386.86
  6. Step 6: Final answer
    x = 455.37

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.