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Finding the Fourth Proportional to 285.48, 394.20 and 192.42

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Solution

The fourth proportional to 285.48, 394.20 and 192.42 is: 265.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.48 : 394.20 = 192.42 : x
  2. Step 2: Convert to fraction form
    285.48/394.20 = 192.42/x
  3. Step 3: Cross multiply
    285.48x = 394.20 × 192.42
  4. Step 4: Simplify right side
    285.48x = 75,851.96
  5. Step 5: Solve for x
    x = 75,851.96/285.48
  6. Step 6: Final answer
    x = 265.70

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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.