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Finding the Fourth Proportional to 284.30, 425.84 and 215.85

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Solution

The fourth proportional to 284.30, 425.84 and 215.85 is: 323.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.30 : 425.84 = 215.85 : x
  2. Step 2: Convert to fraction form
    284.30/425.84 = 215.85/x
  3. Step 3: Cross multiply
    284.30x = 425.84 × 215.85
  4. Step 4: Simplify right side
    284.30x = 91,917.56
  5. Step 5: Solve for x
    x = 91,917.56/284.30
  6. Step 6: Final answer
    x = 323.31

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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.