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Finding the Fourth Proportional to 298.57, 447.90 and 154.21

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Solution

The fourth proportional to 298.57, 447.90 and 154.21 is: 231.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.57 : 447.90 = 154.21 : x
  2. Step 2: Convert to fraction form
    298.57/447.90 = 154.21/x
  3. Step 3: Cross multiply
    298.57x = 447.90 × 154.21
  4. Step 4: Simplify right side
    298.57x = 69,070.66
  5. Step 5: Solve for x
    x = 69,070.66/298.57
  6. Step 6: Final answer
    x = 231.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.