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Finding the Fourth Proportional to 388.69, 536.56 and 231.37

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Solution

The fourth proportional to 388.69, 536.56 and 231.37 is: 319.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.69 : 536.56 = 231.37 : x
  2. Step 2: Convert to fraction form
    388.69/536.56 = 231.37/x
  3. Step 3: Cross multiply
    388.69x = 536.56 × 231.37
  4. Step 4: Simplify right side
    388.69x = 124,143.89
  5. Step 5: Solve for x
    x = 124,143.89/388.69
  6. Step 6: Final answer
    x = 319.39

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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.