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Finding the Fourth Proportional to 284.58, 426.33 and 139.86

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Solution

The fourth proportional to 284.58, 426.33 and 139.86 is: 209.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.58 : 426.33 = 139.86 : x
  2. Step 2: Convert to fraction form
    284.58/426.33 = 139.86/x
  3. Step 3: Cross multiply
    284.58x = 426.33 × 139.86
  4. Step 4: Simplify right side
    284.58x = 59,626.51
  5. Step 5: Solve for x
    x = 59,626.51/284.58
  6. Step 6: Final answer
    x = 209.52

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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.