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Finding the Fourth Proportional to 230.91, 346.54 and 139.65

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Solution

The fourth proportional to 230.91, 346.54 and 139.65 is: 209.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.91 : 346.54 = 139.65 : x
  2. Step 2: Convert to fraction form
    230.91/346.54 = 139.65/x
  3. Step 3: Cross multiply
    230.91x = 346.54 × 139.65
  4. Step 4: Simplify right side
    230.91x = 48,394.31
  5. Step 5: Solve for x
    x = 48,394.31/230.91
  6. Step 6: Final answer
    x = 209.58

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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.