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Finding the Fourth Proportional to 284.90, 393.39 and 229.91

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Solution

The fourth proportional to 284.90, 393.39 and 229.91 is: 317.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.90 : 393.39 = 229.91 : x
  2. Step 2: Convert to fraction form
    284.90/393.39 = 229.91/x
  3. Step 3: Cross multiply
    284.90x = 393.39 × 229.91
  4. Step 4: Simplify right side
    284.90x = 90,442.33
  5. Step 5: Solve for x
    x = 90,442.33/284.90
  6. Step 6: Final answer
    x = 317.45

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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.