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Finding the Fourth Proportional to 285.22, 393.46 and 168.72

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Solution

The fourth proportional to 285.22, 393.46 and 168.72 is: 232.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.22 : 393.46 = 168.72 : x
  2. Step 2: Convert to fraction form
    285.22/393.46 = 168.72/x
  3. Step 3: Cross multiply
    285.22x = 393.46 × 168.72
  4. Step 4: Simplify right side
    285.22x = 66,384.57
  5. Step 5: Solve for x
    x = 66,384.57/285.22
  6. Step 6: Final answer
    x = 232.75

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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.