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Finding the Fourth Proportional to 388.57, 536.24 and 231.22

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Solution

The fourth proportional to 388.57, 536.24 and 231.22 is: 319.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.57 : 536.24 = 231.22 : x
  2. Step 2: Convert to fraction form
    388.57/536.24 = 231.22/x
  3. Step 3: Cross multiply
    388.57x = 536.24 × 231.22
  4. Step 4: Simplify right side
    388.57x = 123,989.41
  5. Step 5: Solve for x
    x = 123,989.41/388.57
  6. Step 6: Final answer
    x = 319.09

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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.