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Finding the Fourth Proportional to 259.96, 389.78 and 137.92

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Solution

The fourth proportional to 259.96, 389.78 and 137.92 is: 206.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.96 : 389.78 = 137.92 : x
  2. Step 2: Convert to fraction form
    259.96/389.78 = 137.92/x
  3. Step 3: Cross multiply
    259.96x = 389.78 × 137.92
  4. Step 4: Simplify right side
    259.96x = 53,758.46
  5. Step 5: Solve for x
    x = 53,758.46/259.96
  6. Step 6: Final answer
    x = 206.80

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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.