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Finding the Fourth Proportional to 354.23, 488.90 and 206.95

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Solution

The fourth proportional to 354.23, 488.90 and 206.95 is: 285.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.23 : 488.90 = 206.95 : x
  2. Step 2: Convert to fraction form
    354.23/488.90 = 206.95/x
  3. Step 3: Cross multiply
    354.23x = 488.90 × 206.95
  4. Step 4: Simplify right side
    354.23x = 101,176.63
  5. Step 5: Solve for x
    x = 101,176.63/354.23
  6. Step 6: Final answer
    x = 285.62

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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.