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Finding the Fourth Proportional to 1,990.88, 2,986.32 and 692.35

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Solution

The fourth proportional to 1,990.88, 2,986.32 and 692.35 is: 1,038.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.88 : 2,986.32 = 692.35 : x
  2. Step 2: Convert to fraction form
    1,990.88/2,986.32 = 692.35/x
  3. Step 3: Cross multiply
    1,990.88x = 2,986.32 × 692.35
  4. Step 4: Simplify right side
    1,990.88x = 2,067,578.65
  5. Step 5: Solve for x
    x = 2,067,578.65/1,990.88
  6. Step 6: Final answer
    x = 1,038.53

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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.