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Finding the Fourth Proportional to 388.63, 536.17 and 231.19

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Solution

The fourth proportional to 388.63, 536.17 and 231.19 is: 318.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.63 : 536.17 = 231.19 : x
  2. Step 2: Convert to fraction form
    388.63/536.17 = 231.19/x
  3. Step 3: Cross multiply
    388.63x = 536.17 × 231.19
  4. Step 4: Simplify right side
    388.63x = 123,957.14
  5. Step 5: Solve for x
    x = 123,957.14/388.63
  6. Step 6: Final answer
    x = 318.96

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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.