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Finding the Fourth Proportional to 285.08, 393.41 and 154.09

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Solution

The fourth proportional to 285.08, 393.41 and 154.09 is: 212.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.08 : 393.41 = 154.09 : x
  2. Step 2: Convert to fraction form
    285.08/393.41 = 154.09/x
  3. Step 3: Cross multiply
    285.08x = 393.41 × 154.09
  4. Step 4: Simplify right side
    285.08x = 60,618.88
  5. Step 5: Solve for x
    x = 60,618.88/285.08
  6. Step 6: Final answer
    x = 212.64

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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.