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Finding the Fourth Proportional to 284.49, 426.87 and 138.17

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Solution

The fourth proportional to 284.49, 426.87 and 138.17 is: 207.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.49 : 426.87 = 138.17 : x
  2. Step 2: Convert to fraction form
    284.49/426.87 = 138.17/x
  3. Step 3: Cross multiply
    284.49x = 426.87 × 138.17
  4. Step 4: Simplify right side
    284.49x = 58,978.49
  5. Step 5: Solve for x
    x = 58,978.49/284.49
  6. Step 6: Final answer
    x = 207.31

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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.