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Finding the Fourth Proportional to 255.91, 383.91 and 82.58

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Solution

The fourth proportional to 255.91, 383.91 and 82.58 is: 123.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.91 : 383.91 = 82.58 : x
  2. Step 2: Convert to fraction form
    255.91/383.91 = 82.58/x
  3. Step 3: Cross multiply
    255.91x = 383.91 × 82.58
  4. Step 4: Simplify right side
    255.91x = 31,701.92
  5. Step 5: Solve for x
    x = 31,701.92/255.91
  6. Step 6: Final answer
    x = 123.88

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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.