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Finding the Fourth Proportional to 259.40, 389.26 and 113.22

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Solution

The fourth proportional to 259.40, 389.26 and 113.22 is: 169.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.40 : 389.26 = 113.22 : x
  2. Step 2: Convert to fraction form
    259.40/389.26 = 113.22/x
  3. Step 3: Cross multiply
    259.40x = 389.26 × 113.22
  4. Step 4: Simplify right side
    259.40x = 44,072.02
  5. Step 5: Solve for x
    x = 44,072.02/259.40
  6. Step 6: Final answer
    x = 169.90

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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.