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Finding the Fourth Proportional to 284.34, 426.47 and 119.78

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Solution

The fourth proportional to 284.34, 426.47 and 119.78 is: 179.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.34 : 426.47 = 119.78 : x
  2. Step 2: Convert to fraction form
    284.34/426.47 = 119.78/x
  3. Step 3: Cross multiply
    284.34x = 426.47 × 119.78
  4. Step 4: Simplify right side
    284.34x = 51,079.85
  5. Step 5: Solve for x
    x = 51,079.85/284.34
  6. Step 6: Final answer
    x = 179.64

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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.