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Finding the Fourth Proportional to 285.36, 393.72 and 167.28

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Solution

The fourth proportional to 285.36, 393.72 and 167.28 is: 230.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.36 : 393.72 = 167.28 : x
  2. Step 2: Convert to fraction form
    285.36/393.72 = 167.28/x
  3. Step 3: Cross multiply
    285.36x = 393.72 × 167.28
  4. Step 4: Simplify right side
    285.36x = 65,861.48
  5. Step 5: Solve for x
    x = 65,861.48/285.36
  6. Step 6: Final answer
    x = 230.80

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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.