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Finding the Fourth Proportional to 284.67, 393.21 and 219.51

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Solution

The fourth proportional to 284.67, 393.21 and 219.51 is: 303.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.67 : 393.21 = 219.51 : x
  2. Step 2: Convert to fraction form
    284.67/393.21 = 219.51/x
  3. Step 3: Cross multiply
    284.67x = 393.21 × 219.51
  4. Step 4: Simplify right side
    284.67x = 86,313.53
  5. Step 5: Solve for x
    x = 86,313.53/284.67
  6. Step 6: Final answer
    x = 303.21

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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.