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Finding the Fourth Proportional to 259.82, 389.49 and 191.69

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Solution

The fourth proportional to 259.82, 389.49 and 191.69 is: 287.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.82 : 389.49 = 191.69 : x
  2. Step 2: Convert to fraction form
    259.82/389.49 = 191.69/x
  3. Step 3: Cross multiply
    259.82x = 389.49 × 191.69
  4. Step 4: Simplify right side
    259.82x = 74,661.34
  5. Step 5: Solve for x
    x = 74,661.34/259.82
  6. Step 6: Final answer
    x = 287.36

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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.