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Finding the Fourth Proportional to 1,999.70, 2,999.19 and 1,177.01

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Solution

The fourth proportional to 1,999.70, 2,999.19 and 1,177.01 is: 1,765.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,999.70 : 2,999.19 = 1,177.01 : x
  2. Step 2: Convert to fraction form
    1,999.70/2,999.19 = 1,177.01/x
  3. Step 3: Cross multiply
    1,999.70x = 2,999.19 × 1,177.01
  4. Step 4: Simplify right side
    1,999.70x = 3,530,084.12
  5. Step 5: Solve for x
    x = 3,530,084.12/1,999.70
  6. Step 6: Final answer
    x = 1,765.30

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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.