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Finding the Fourth Proportional to 1,999.10, 2,998.88 and 829.20

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Solution

The fourth proportional to 1,999.10, 2,998.88 and 829.20 is: 1,243.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,999.10 : 2,998.88 = 829.20 : x
  2. Step 2: Convert to fraction form
    1,999.10/2,998.88 = 829.20/x
  3. Step 3: Cross multiply
    1,999.10x = 2,998.88 × 829.20
  4. Step 4: Simplify right side
    1,999.10x = 2,486,671.30
  5. Step 5: Solve for x
    x = 2,486,671.30/1,999.10
  6. Step 6: Final answer
    x = 1,243.90

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1.5x scale

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.