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Finding the Fourth Proportional to 284.07, 391.11 and 221.82

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Solution

The fourth proportional to 284.07, 391.11 and 221.82 is: 305.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.07 : 391.11 = 221.82 : x
  2. Step 2: Convert to fraction form
    284.07/391.11 = 221.82/x
  3. Step 3: Cross multiply
    284.07x = 391.11 × 221.82
  4. Step 4: Simplify right side
    284.07x = 86,756.02
  5. Step 5: Solve for x
    x = 86,756.02/284.07
  6. Step 6: Final answer
    x = 305.40

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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.