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Finding the Fourth Proportional to 259.41, 389 and 137.65

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Solution

The fourth proportional to 259.41, 389 and 137.65 is: 206.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.41 : 389 = 137.65 : x
  2. Step 2: Convert to fraction form
    259.41/389 = 137.65/x
  3. Step 3: Cross multiply
    259.41x = 389 × 137.65
  4. Step 4: Simplify right side
    259.41x = 53,543.91
  5. Step 5: Solve for x
    x = 53,543.91/259.41
  6. Step 6: Final answer
    x = 206.41

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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.