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Finding the Fourth Proportional to 285.08, 393.49 and 186.84

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Solution

The fourth proportional to 285.08, 393.49 and 186.84 is: 257.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.08 : 393.49 = 186.84 : x
  2. Step 2: Convert to fraction form
    285.08/393.49 = 186.84/x
  3. Step 3: Cross multiply
    285.08x = 393.49 × 186.84
  4. Step 4: Simplify right side
    285.08x = 73,517.75
  5. Step 5: Solve for x
    x = 73,517.75/285.08
  6. Step 6: Final answer
    x = 257.89

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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.