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Finding the Fourth Proportional to 284.86, 393.24 and 229.78

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Solution

The fourth proportional to 284.86, 393.24 and 229.78 is: 317.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.86 : 393.24 = 229.78 : x
  2. Step 2: Convert to fraction form
    284.86/393.24 = 229.78/x
  3. Step 3: Cross multiply
    284.86x = 393.24 × 229.78
  4. Step 4: Simplify right side
    284.86x = 90,358.69
  5. Step 5: Solve for x
    x = 90,358.69/284.86
  6. Step 6: Final answer
    x = 317.20

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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.