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Finding the Fourth Proportional to 270.90, 404.27 and 209.70

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Solution

The fourth proportional to 270.90, 404.27 and 209.70 is: 312.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    270.90 : 404.27 = 209.70 : x
  2. Step 2: Convert to fraction form
    270.90/404.27 = 209.70/x
  3. Step 3: Cross multiply
    270.90x = 404.27 × 209.70
  4. Step 4: Simplify right side
    270.90x = 84,774.37
  5. Step 5: Solve for x
    x = 84,774.37/270.90
  6. Step 6: Final answer
    x = 312.94

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.