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Finding the Fourth Proportional to 260.22, 387.11 and 257.61

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Solution

The fourth proportional to 260.22, 387.11 and 257.61 is: 383.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.22 : 387.11 = 257.61 : x
  2. Step 2: Convert to fraction form
    260.22/387.11 = 257.61/x
  3. Step 3: Cross multiply
    260.22x = 387.11 × 257.61
  4. Step 4: Simplify right side
    260.22x = 99,722.12
  5. Step 5: Solve for x
    x = 99,722.12/260.22
  6. Step 6: Final answer
    x = 383.22

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.