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Finding the Fourth Proportional to 284.15, 426.38 and 139.88

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Solution

The fourth proportional to 284.15, 426.38 and 139.88 is: 209.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.15 : 426.38 = 139.88 : x
  2. Step 2: Convert to fraction form
    284.15/426.38 = 139.88/x
  3. Step 3: Cross multiply
    284.15x = 426.38 × 139.88
  4. Step 4: Simplify right side
    284.15x = 59,642.03
  5. Step 5: Solve for x
    x = 59,642.03/284.15
  6. Step 6: Final answer
    x = 209.90

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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.