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Finding the Fourth Proportional to 285.96, 394.63 and 154.97

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Solution

The fourth proportional to 285.96, 394.63 and 154.97 is: 213.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.96 : 394.63 = 154.97 : x
  2. Step 2: Convert to fraction form
    285.96/394.63 = 154.97/x
  3. Step 3: Cross multiply
    285.96x = 394.63 × 154.97
  4. Step 4: Simplify right side
    285.96x = 61,155.42
  5. Step 5: Solve for x
    x = 61,155.42/285.96
  6. Step 6: Final answer
    x = 213.86

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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.