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Finding the Fourth Proportional to 284.78, 427.09 and 79.29

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Solution

The fourth proportional to 284.78, 427.09 and 79.29 is: 118.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.78 : 427.09 = 79.29 : x
  2. Step 2: Convert to fraction form
    284.78/427.09 = 79.29/x
  3. Step 3: Cross multiply
    284.78x = 427.09 × 79.29
  4. Step 4: Simplify right side
    284.78x = 33,863.97
  5. Step 5: Solve for x
    x = 33,863.97/284.78
  6. Step 6: Final answer
    x = 118.91

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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.