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Finding the Fourth Proportional to 284.24, 426.40 and 121.92

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Solution

The fourth proportional to 284.24, 426.40 and 121.92 is: 182.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.24 : 426.40 = 121.92 : x
  2. Step 2: Convert to fraction form
    284.24/426.40 = 121.92/x
  3. Step 3: Cross multiply
    284.24x = 426.40 × 121.92
  4. Step 4: Simplify right side
    284.24x = 51,986.69
  5. Step 5: Solve for x
    x = 51,986.69/284.24
  6. Step 6: Final answer
    x = 182.90

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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.