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Finding the Fourth Proportional to 393.42, 589.17 and 231.15

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Solution

The fourth proportional to 393.42, 589.17 and 231.15 is: 346.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.42 : 589.17 = 231.15 : x
  2. Step 2: Convert to fraction form
    393.42/589.17 = 231.15/x
  3. Step 3: Cross multiply
    393.42x = 589.17 × 231.15
  4. Step 4: Simplify right side
    393.42x = 136,186.65
  5. Step 5: Solve for x
    x = 136,186.65/393.42
  6. Step 6: Final answer
    x = 346.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.