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Finding the Fourth Proportional to 285.05, 393.36 and 160.72

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Solution

The fourth proportional to 285.05, 393.36 and 160.72 is: 221.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.05 : 393.36 = 160.72 : x
  2. Step 2: Convert to fraction form
    285.05/393.36 = 160.72/x
  3. Step 3: Cross multiply
    285.05x = 393.36 × 160.72
  4. Step 4: Simplify right side
    285.05x = 63,218.85
  5. Step 5: Solve for x
    x = 63,218.85/285.05
  6. Step 6: Final answer
    x = 221.78

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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.