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Finding the Fourth Proportional to 649.43, 896.21 and 354.70

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Solution

The fourth proportional to 649.43, 896.21 and 354.70 is: 489.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.43 : 896.21 = 354.70 : x
  2. Step 2: Convert to fraction form
    649.43/896.21 = 354.70/x
  3. Step 3: Cross multiply
    649.43x = 896.21 × 354.70
  4. Step 4: Simplify right side
    649.43x = 317,885.69
  5. Step 5: Solve for x
    x = 317,885.69/649.43
  6. Step 6: Final answer
    x = 489.48

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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.