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Finding the Fourth Proportional to 1,698.68, 2,344.21 and 990.94

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Solution

The fourth proportional to 1,698.68, 2,344.21 and 990.94 is: 1,367.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,698.68 : 2,344.21 = 990.94 : x
  2. Step 2: Convert to fraction form
    1,698.68/2,344.21 = 990.94/x
  3. Step 3: Cross multiply
    1,698.68x = 2,344.21 × 990.94
  4. Step 4: Simplify right side
    1,698.68x = 2,322,977.31
  5. Step 5: Solve for x
    x = 2,322,977.31/1,698.68
  6. Step 6: Final answer
    x = 1,367.52

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1.5x scale

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.