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Finding the Fourth Proportional to 285.67, 394.23 and 154.68

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Solution

The fourth proportional to 285.67, 394.23 and 154.68 is: 213.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.67 : 394.23 = 154.68 : x
  2. Step 2: Convert to fraction form
    285.67/394.23 = 154.68/x
  3. Step 3: Cross multiply
    285.67x = 394.23 × 154.68
  4. Step 4: Simplify right side
    285.67x = 60,978.42
  5. Step 5: Solve for x
    x = 60,978.42/285.67
  6. Step 6: Final answer
    x = 213.45

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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.