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Finding the Fourth Proportional to 259.82, 389.48 and 138.17

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Solution

The fourth proportional to 259.82, 389.48 and 138.17 is: 207.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.82 : 389.48 = 138.17 : x
  2. Step 2: Convert to fraction form
    259.82/389.48 = 138.17/x
  3. Step 3: Cross multiply
    259.82x = 389.48 × 138.17
  4. Step 4: Simplify right side
    259.82x = 53,811.81
  5. Step 5: Solve for x
    x = 53,811.81/259.82
  6. Step 6: Final answer
    x = 207.12

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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.