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Finding the Fourth Proportional to 271.79, 374.92 and 209.60

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Solution

The fourth proportional to 271.79, 374.92 and 209.60 is: 289.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    271.79 : 374.92 = 209.60 : x
  2. Step 2: Convert to fraction form
    271.79/374.92 = 209.60/x
  3. Step 3: Cross multiply
    271.79x = 374.92 × 209.60
  4. Step 4: Simplify right side
    271.79x = 78,581.36
  5. Step 5: Solve for x
    x = 78,581.36/271.79
  6. Step 6: Final answer
    x = 289.13

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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.