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Finding the Fourth Proportional to 284.61, 426.90 and 79.21

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Solution

The fourth proportional to 284.61, 426.90 and 79.21 is: 118.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.61 : 426.90 = 79.21 : x
  2. Step 2: Convert to fraction form
    284.61/426.90 = 79.21/x
  3. Step 3: Cross multiply
    284.61x = 426.90 × 79.21
  4. Step 4: Simplify right side
    284.61x = 33,815.58
  5. Step 5: Solve for x
    x = 33,815.58/284.61
  6. Step 6: Final answer
    x = 118.81

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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.