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Finding the Fourth Proportional to 998.87, 1,378.41 and 626.05

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Solution

The fourth proportional to 998.87, 1,378.41 and 626.05 is: 863.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.87 : 1,378.41 = 626.05 : x
  2. Step 2: Convert to fraction form
    998.87/1,378.41 = 626.05/x
  3. Step 3: Cross multiply
    998.87x = 1,378.41 × 626.05
  4. Step 4: Simplify right side
    998.87x = 862,950.45
  5. Step 5: Solve for x
    x = 862,950.45/998.87
  6. Step 6: Final answer
    x = 863.93

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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.