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Finding the Fourth Proportional to 285.98, 394.65 and 154.99

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Solution

The fourth proportional to 285.98, 394.65 and 154.99 is: 213.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.98 : 394.65 = 154.99 : x
  2. Step 2: Convert to fraction form
    285.98/394.65 = 154.99/x
  3. Step 3: Cross multiply
    285.98x = 394.65 × 154.99
  4. Step 4: Simplify right side
    285.98x = 61,164.44
  5. Step 5: Solve for x
    x = 61,164.44/285.98
  6. Step 6: Final answer
    x = 213.88

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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.