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Finding the Fourth Proportional to 285.45, 393.94 and 161.12

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Solution

The fourth proportional to 285.45, 393.94 and 161.12 is: 222.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.45 : 393.94 = 161.12 : x
  2. Step 2: Convert to fraction form
    285.45/393.94 = 161.12/x
  3. Step 3: Cross multiply
    285.45x = 393.94 × 161.12
  4. Step 4: Simplify right side
    285.45x = 63,468.84
  5. Step 5: Solve for x
    x = 63,468.84/285.45
  6. Step 6: Final answer
    x = 222.35

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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.