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Finding the Fourth Proportional to 298.70, 447.71 and 136.40

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Solution

The fourth proportional to 298.70, 447.71 and 136.40 is: 204.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.70 : 447.71 = 136.40 : x
  2. Step 2: Convert to fraction form
    298.70/447.71 = 136.40/x
  3. Step 3: Cross multiply
    298.70x = 447.71 × 136.40
  4. Step 4: Simplify right side
    298.70x = 61,066.96
  5. Step 5: Solve for x
    x = 61,066.96/298.70
  6. Step 6: Final answer
    x = 204.44

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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.