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Finding the Fourth Proportional to 1,990.61, 2,986.37 and 692.07

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Solution

The fourth proportional to 1,990.61, 2,986.37 and 692.07 is: 1,038.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.61 : 2,986.37 = 692.07 : x
  2. Step 2: Convert to fraction form
    1,990.61/2,986.37 = 692.07/x
  3. Step 3: Cross multiply
    1,990.61x = 2,986.37 × 692.07
  4. Step 4: Simplify right side
    1,990.61x = 2,066,773.63
  5. Step 5: Solve for x
    x = 2,066,773.63/1,990.61
  6. Step 6: Final answer
    x = 1,038.26

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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.