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Finding the Fourth Proportional to 353.99, 488.49 and 206.64

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Solution

The fourth proportional to 353.99, 488.49 and 206.64 is: 285.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.99 : 488.49 = 206.64 : x
  2. Step 2: Convert to fraction form
    353.99/488.49 = 206.64/x
  3. Step 3: Cross multiply
    353.99x = 488.49 × 206.64
  4. Step 4: Simplify right side
    353.99x = 100,941.57
  5. Step 5: Solve for x
    x = 100,941.57/353.99
  6. Step 6: Final answer
    x = 285.16

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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.