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Finding the Fourth Proportional to 1,999.20, 2,995.20 and 1,878.72

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Solution

The fourth proportional to 1,999.20, 2,995.20 and 1,878.72 is: 2,814.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,999.20 : 2,995.20 = 1,878.72 : x
  2. Step 2: Convert to fraction form
    1,999.20/2,995.20 = 1,878.72/x
  3. Step 3: Cross multiply
    1,999.20x = 2,995.20 × 1,878.72
  4. Step 4: Simplify right side
    1,999.20x = 5,627,142.14
  5. Step 5: Solve for x
    x = 5,627,142.14/1,999.20
  6. Step 6: Final answer
    x = 2,814.70

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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.