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Finding the Fourth Proportional to 285.65, 394.19 and 154.65

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Solution

The fourth proportional to 285.65, 394.19 and 154.65 is: 213.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.65 : 394.19 = 154.65 : x
  2. Step 2: Convert to fraction form
    285.65/394.19 = 154.65/x
  3. Step 3: Cross multiply
    285.65x = 394.19 × 154.65
  4. Step 4: Simplify right side
    285.65x = 60,962.47
  5. Step 5: Solve for x
    x = 60,962.47/285.65
  6. Step 6: Final answer
    x = 213.42

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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.