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Finding the Fourth Proportional to 386.45, 531.91 and 349.53

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Solution

The fourth proportional to 386.45, 531.91 and 349.53 is: 481.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.45 : 531.91 = 349.53 : x
  2. Step 2: Convert to fraction form
    386.45/531.91 = 349.53/x
  3. Step 3: Cross multiply
    386.45x = 531.91 × 349.53
  4. Step 4: Simplify right side
    386.45x = 185,918.50
  5. Step 5: Solve for x
    x = 185,918.50/386.45
  6. Step 6: Final answer
    x = 481.09

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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.