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Finding the Fourth Proportional to 340.82, 470.36 and 209.86

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Solution

The fourth proportional to 340.82, 470.36 and 209.86 is: 289.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.82 : 470.36 = 209.86 : x
  2. Step 2: Convert to fraction form
    340.82/470.36 = 209.86/x
  3. Step 3: Cross multiply
    340.82x = 470.36 × 209.86
  4. Step 4: Simplify right side
    340.82x = 98,709.75
  5. Step 5: Solve for x
    x = 98,709.75/340.82
  6. Step 6: Final answer
    x = 289.62

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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.