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Finding the Fourth Proportional to 649.81, 896.71 and 397.66

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Solution

The fourth proportional to 649.81, 896.71 and 397.66 is: 548.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.81 : 896.71 = 397.66 : x
  2. Step 2: Convert to fraction form
    649.81/896.71 = 397.66/x
  3. Step 3: Cross multiply
    649.81x = 896.71 × 397.66
  4. Step 4: Simplify right side
    649.81x = 356,585.70
  5. Step 5: Solve for x
    x = 356,585.70/649.81
  6. Step 6: Final answer
    x = 548.75

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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.