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Finding the Fourth Proportional to 284.80, 393.44 and 229.90

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Solution

The fourth proportional to 284.80, 393.44 and 229.90 is: 317.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.80 : 393.44 = 229.90 : x
  2. Step 2: Convert to fraction form
    284.80/393.44 = 229.90/x
  3. Step 3: Cross multiply
    284.80x = 393.44 × 229.90
  4. Step 4: Simplify right side
    284.80x = 90,451.86
  5. Step 5: Solve for x
    x = 90,451.86/284.80
  6. Step 6: Final answer
    x = 317.60

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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.