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Finding the Fourth Proportional to 284.81, 427.21 and 79.39

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Solution

The fourth proportional to 284.81, 427.21 and 79.39 is: 119.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.81 : 427.21 = 79.39 : x
  2. Step 2: Convert to fraction form
    284.81/427.21 = 79.39/x
  3. Step 3: Cross multiply
    284.81x = 427.21 × 79.39
  4. Step 4: Simplify right side
    284.81x = 33,916.20
  5. Step 5: Solve for x
    x = 33,916.20/284.81
  6. Step 6: Final answer
    x = 119.08

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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.