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Finding the Fourth Proportional to 649.69, 896.36 and 400.75

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Solution

The fourth proportional to 649.69, 896.36 and 400.75 is: 552.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.69 : 896.36 = 400.75 : x
  2. Step 2: Convert to fraction form
    649.69/896.36 = 400.75/x
  3. Step 3: Cross multiply
    649.69x = 896.36 × 400.75
  4. Step 4: Simplify right side
    649.69x = 359,212.03
  5. Step 5: Solve for x
    x = 359,212.03/649.69
  6. Step 6: Final answer
    x = 552.90

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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.