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Finding the Fourth Proportional to 285.86, 426.80 and 255.08

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Solution

The fourth proportional to 285.86, 426.80 and 255.08 is: 380.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.86 : 426.80 = 255.08 : x
  2. Step 2: Convert to fraction form
    285.86/426.80 = 255.08/x
  3. Step 3: Cross multiply
    285.86x = 426.80 × 255.08
  4. Step 4: Simplify right side
    285.86x = 108,868.14
  5. Step 5: Solve for x
    x = 108,868.14/285.86
  6. Step 6: Final answer
    x = 380.84

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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.