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Finding the Fourth Proportional to 285.13, 393.48 and 154.14

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Solution

The fourth proportional to 285.13, 393.48 and 154.14 is: 212.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.13 : 393.48 = 154.14 : x
  2. Step 2: Convert to fraction form
    285.13/393.48 = 154.14/x
  3. Step 3: Cross multiply
    285.13x = 393.48 × 154.14
  4. Step 4: Simplify right side
    285.13x = 60,648.95
  5. Step 5: Solve for x
    x = 60,648.95/285.13
  6. Step 6: Final answer
    x = 212.71

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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.