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Finding the Fourth Proportional to 285.46, 393.94 and 154.47

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Solution

The fourth proportional to 285.46, 393.94 and 154.47 is: 213.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.46 : 393.94 = 154.47 : x
  2. Step 2: Convert to fraction form
    285.46/393.94 = 154.47/x
  3. Step 3: Cross multiply
    285.46x = 393.94 × 154.47
  4. Step 4: Simplify right side
    285.46x = 60,851.14
  5. Step 5: Solve for x
    x = 60,851.14/285.46
  6. Step 6: Final answer
    x = 213.17

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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.