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Finding the Fourth Proportional to 284.90, 393.18 and 186.92

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Solution

The fourth proportional to 284.90, 393.18 and 186.92 is: 257.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.90 : 393.18 = 186.92 : x
  2. Step 2: Convert to fraction form
    284.90/393.18 = 186.92/x
  3. Step 3: Cross multiply
    284.90x = 393.18 × 186.92
  4. Step 4: Simplify right side
    284.90x = 73,493.21
  5. Step 5: Solve for x
    x = 73,493.21/284.90
  6. Step 6: Final answer
    x = 257.96

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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.