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Finding the Fourth Proportional to 231.22, 345.14 and 215.22

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Solution

The fourth proportional to 231.22, 345.14 and 215.22 is: 321.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.22 : 345.14 = 215.22 : x
  2. Step 2: Convert to fraction form
    231.22/345.14 = 215.22/x
  3. Step 3: Cross multiply
    231.22x = 345.14 × 215.22
  4. Step 4: Simplify right side
    231.22x = 74,281.03
  5. Step 5: Solve for x
    x = 74,281.03/231.22
  6. Step 6: Final answer
    x = 321.26

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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.