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Finding the Fourth Proportional to 386.57, 533.46 and 231.32

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Solution

The fourth proportional to 386.57, 533.46 and 231.32 is: 319.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.57 : 533.46 = 231.32 : x
  2. Step 2: Convert to fraction form
    386.57/533.46 = 231.32/x
  3. Step 3: Cross multiply
    386.57x = 533.46 × 231.32
  4. Step 4: Simplify right side
    386.57x = 123,397.30
  5. Step 5: Solve for x
    x = 123,397.30/386.57
  6. Step 6: Final answer
    x = 319.21

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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.