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Finding the Fourth Proportional to 285.45, 393.89 and 161.10

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Solution

The fourth proportional to 285.45, 393.89 and 161.10 is: 222.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.45 : 393.89 = 161.10 : x
  2. Step 2: Convert to fraction form
    285.45/393.89 = 161.10/x
  3. Step 3: Cross multiply
    285.45x = 393.89 × 161.10
  4. Step 4: Simplify right side
    285.45x = 63,455.68
  5. Step 5: Solve for x
    x = 63,455.68/285.45
  6. Step 6: Final answer
    x = 222.30

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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.