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Finding the Fourth Proportional to 340.64, 470.12 and 209.65

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Solution

The fourth proportional to 340.64, 470.12 and 209.65 is: 289.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.64 : 470.12 = 209.65 : x
  2. Step 2: Convert to fraction form
    340.64/470.12 = 209.65/x
  3. Step 3: Cross multiply
    340.64x = 470.12 × 209.65
  4. Step 4: Simplify right side
    340.64x = 98,560.01
  5. Step 5: Solve for x
    x = 98,560.01/340.64
  6. Step 6: Final answer
    x = 289.34

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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.