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Finding the Fourth Proportional to 2,198.88, 3,298.32 and 638.98

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Solution

The fourth proportional to 2,198.88, 3,298.32 and 638.98 is: 958.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,198.88 : 3,298.32 = 638.98 : x
  2. Step 2: Convert to fraction form
    2,198.88/3,298.32 = 638.98/x
  3. Step 3: Cross multiply
    2,198.88x = 3,298.32 × 638.98
  4. Step 4: Simplify right side
    2,198.88x = 2,107,560.51
  5. Step 5: Solve for x
    x = 2,107,560.51/2,198.88
  6. Step 6: Final answer
    x = 958.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.