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Finding the Fourth Proportional to 2,999.80, 4,499.70 and 1,900.90

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Solution

The fourth proportional to 2,999.80, 4,499.70 and 1,900.90 is: 2,851.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,999.80 : 4,499.70 = 1,900.90 : x
  2. Step 2: Convert to fraction form
    2,999.80/4,499.70 = 1,900.90/x
  3. Step 3: Cross multiply
    2,999.80x = 4,499.70 × 1,900.90
  4. Step 4: Simplify right side
    2,999.80x = 8,553,479.73
  5. Step 5: Solve for x
    x = 8,553,479.73/2,999.80
  6. Step 6: Final answer
    x = 2,851.35

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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.