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Finding the Fourth Proportional to 1,991.32, 2,987.00 and 692.79

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Solution

The fourth proportional to 1,991.32, 2,987.00 and 692.79 is: 1,039.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.32 : 2,987.00 = 692.79 : x
  2. Step 2: Convert to fraction form
    1,991.32/2,987.00 = 692.79/x
  3. Step 3: Cross multiply
    1,991.32x = 2,987.00 × 692.79
  4. Step 4: Simplify right side
    1,991.32x = 2,069,351.66
  5. Step 5: Solve for x
    x = 2,069,351.66/1,991.32
  6. Step 6: Final answer
    x = 1,039.19

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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.