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Finding the Fourth Proportional to 1,991.51, 2,987.76 and 692.99

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Solution

The fourth proportional to 1,991.51, 2,987.76 and 692.99 is: 1,039.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.51 : 2,987.76 = 692.99 : x
  2. Step 2: Convert to fraction form
    1,991.51/2,987.76 = 692.99/x
  3. Step 3: Cross multiply
    1,991.51x = 2,987.76 × 692.99
  4. Step 4: Simplify right side
    1,991.51x = 2,070,487.80
  5. Step 5: Solve for x
    x = 2,070,487.80/1,991.51
  6. Step 6: Final answer
    x = 1,039.66

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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.