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Finding the Fourth Proportional to 260.43, 390.65 and 169.31

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Solution

The fourth proportional to 260.43, 390.65 and 169.31 is: 253.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.43 : 390.65 = 169.31 : x
  2. Step 2: Convert to fraction form
    260.43/390.65 = 169.31/x
  3. Step 3: Cross multiply
    260.43x = 390.65 × 169.31
  4. Step 4: Simplify right side
    260.43x = 66,138.15
  5. Step 5: Solve for x
    x = 66,138.15/260.43
  6. Step 6: Final answer
    x = 253.96

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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.