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Finding the Fourth Proportional to 231.13, 345.31 and 172.30

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Solution

The fourth proportional to 231.13, 345.31 and 172.30 is: 257.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.13 : 345.31 = 172.30 : x
  2. Step 2: Convert to fraction form
    231.13/345.31 = 172.30/x
  3. Step 3: Cross multiply
    231.13x = 345.31 × 172.30
  4. Step 4: Simplify right side
    231.13x = 59,496.91
  5. Step 5: Solve for x
    x = 59,496.91/231.13
  6. Step 6: Final answer
    x = 257.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.