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Finding the Fourth Proportional to 289.77, 400.86 and 255.30

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Solution

The fourth proportional to 289.77, 400.86 and 255.30 is: 353.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.77 : 400.86 = 255.30 : x
  2. Step 2: Convert to fraction form
    289.77/400.86 = 255.30/x
  3. Step 3: Cross multiply
    289.77x = 400.86 × 255.30
  4. Step 4: Simplify right side
    289.77x = 102,339.56
  5. Step 5: Solve for x
    x = 102,339.56/289.77
  6. Step 6: Final answer
    x = 353.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.