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Finding the Fourth Proportional to 285.15, 393.78 and 269.81

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Solution

The fourth proportional to 285.15, 393.78 and 269.81 is: 372.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.15 : 393.78 = 269.81 : x
  2. Step 2: Convert to fraction form
    285.15/393.78 = 269.81/x
  3. Step 3: Cross multiply
    285.15x = 393.78 × 269.81
  4. Step 4: Simplify right side
    285.15x = 106,245.78
  5. Step 5: Solve for x
    x = 106,245.78/285.15
  6. Step 6: Final answer
    x = 372.60

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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.