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Finding the Fourth Proportional to 998.44, 1,378.50 and 649.64

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Solution

The fourth proportional to 998.44, 1,378.50 and 649.64 is: 896.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.44 : 1,378.50 = 649.64 : x
  2. Step 2: Convert to fraction form
    998.44/1,378.50 = 649.64/x
  3. Step 3: Cross multiply
    998.44x = 1,378.50 × 649.64
  4. Step 4: Simplify right side
    998.44x = 895,528.74
  5. Step 5: Solve for x
    x = 895,528.74/998.44
  6. Step 6: Final answer
    x = 896.93

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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.