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Finding the Fourth Proportional to 259.78, 389.37 and 113.65

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Solution

The fourth proportional to 259.78, 389.37 and 113.65 is: 170.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.78 : 389.37 = 113.65 : x
  2. Step 2: Convert to fraction form
    259.78/389.37 = 113.65/x
  3. Step 3: Cross multiply
    259.78x = 389.37 × 113.65
  4. Step 4: Simplify right side
    259.78x = 44,251.90
  5. Step 5: Solve for x
    x = 44,251.90/259.78
  6. Step 6: Final answer
    x = 170.34

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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.