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Finding the Fourth Proportional to 284.90, 393.30 and 211.39

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Solution

The fourth proportional to 284.90, 393.30 and 211.39 is: 291.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.90 : 393.30 = 211.39 : x
  2. Step 2: Convert to fraction form
    284.90/393.30 = 211.39/x
  3. Step 3: Cross multiply
    284.90x = 393.30 × 211.39
  4. Step 4: Simplify right side
    284.90x = 83,138.70
  5. Step 5: Solve for x
    x = 83,138.70/284.90
  6. Step 6: Final answer
    x = 291.82

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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.