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Finding the Fourth Proportional to 649.91, 896.84 and 355.12

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Solution

The fourth proportional to 649.91, 896.84 and 355.12 is: 490.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.91 : 896.84 = 355.12 : x
  2. Step 2: Convert to fraction form
    649.91/896.84 = 355.12/x
  3. Step 3: Cross multiply
    649.91x = 896.84 × 355.12
  4. Step 4: Simplify right side
    649.91x = 318,485.82
  5. Step 5: Solve for x
    x = 318,485.82/649.91
  6. Step 6: Final answer
    x = 490.05

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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.