Home / 1,991.19-2,986.75-692.63

Finding the Fourth Proportional to 1,991.19, 2,986.75 and 692.63

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Solution

The fourth proportional to 1,991.19, 2,986.75 and 692.63 is: 1,038.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.19 : 2,986.75 = 692.63 : x
  2. Step 2: Convert to fraction form
    1,991.19/2,986.75 = 692.63/x
  3. Step 3: Cross multiply
    1,991.19x = 2,986.75 × 692.63
  4. Step 4: Simplify right side
    1,991.19x = 2,068,712.65
  5. Step 5: Solve for x
    x = 2,068,712.65/1,991.19
  6. Step 6: Final answer
    x = 1,038.93

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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.