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Finding the Fourth Proportional to 284.64, 391.68 and 255.48

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Solution

The fourth proportional to 284.64, 391.68 and 255.48 is: 351.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.64 : 391.68 = 255.48 : x
  2. Step 2: Convert to fraction form
    284.64/391.68 = 255.48/x
  3. Step 3: Cross multiply
    284.64x = 391.68 × 255.48
  4. Step 4: Simplify right side
    284.64x = 100,066.41
  5. Step 5: Solve for x
    x = 100,066.41/284.64
  6. Step 6: Final answer
    x = 351.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.