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Finding the Fourth Proportional to 230.65, 345.91 and 84.39

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Solution

The fourth proportional to 230.65, 345.91 and 84.39 is: 126.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.65 : 345.91 = 84.39 : x
  2. Step 2: Convert to fraction form
    230.65/345.91 = 84.39/x
  3. Step 3: Cross multiply
    230.65x = 345.91 × 84.39
  4. Step 4: Simplify right side
    230.65x = 29,191.34
  5. Step 5: Solve for x
    x = 29,191.34/230.65
  6. Step 6: Final answer
    x = 126.56

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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.