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Finding the Fourth Proportional to 1,999.80, 2,999.70 and 539.10

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Solution

The fourth proportional to 1,999.80, 2,999.70 and 539.10 is: 808.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,999.80 : 2,999.70 = 539.10 : x
  2. Step 2: Convert to fraction form
    1,999.80/2,999.70 = 539.10/x
  3. Step 3: Cross multiply
    1,999.80x = 2,999.70 × 539.10
  4. Step 4: Simplify right side
    1,999.80x = 1,617,138.27
  5. Step 5: Solve for x
    x = 1,617,138.27/1,999.80
  6. Step 6: Final answer
    x = 808.65

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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.