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Finding the Fourth Proportional to 285.43, 394.05 and 185.98

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Solution

The fourth proportional to 285.43, 394.05 and 185.98 is: 256.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.43 : 394.05 = 185.98 : x
  2. Step 2: Convert to fraction form
    285.43/394.05 = 185.98/x
  3. Step 3: Cross multiply
    285.43x = 394.05 × 185.98
  4. Step 4: Simplify right side
    285.43x = 73,285.42
  5. Step 5: Solve for x
    x = 73,285.42/285.43
  6. Step 6: Final answer
    x = 256.75

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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.