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Finding the Fourth Proportional to 649.88, 896.77 and 387.98

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Solution

The fourth proportional to 649.88, 896.77 and 387.98 is: 535.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.88 : 896.77 = 387.98 : x
  2. Step 2: Convert to fraction form
    649.88/896.77 = 387.98/x
  3. Step 3: Cross multiply
    649.88x = 896.77 × 387.98
  4. Step 4: Simplify right side
    649.88x = 347,928.82
  5. Step 5: Solve for x
    x = 347,928.82/649.88
  6. Step 6: Final answer
    x = 535.37

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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.