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Finding the Fourth Proportional to 2,999.88, 4,500.12 and 919.86

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Solution

The fourth proportional to 2,999.88, 4,500.12 and 919.86 is: 1,379.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,999.88 : 4,500.12 = 919.86 : x
  2. Step 2: Convert to fraction form
    2,999.88/4,500.12 = 919.86/x
  3. Step 3: Cross multiply
    2,999.88x = 4,500.12 × 919.86
  4. Step 4: Simplify right side
    2,999.88x = 4,139,480.38
  5. Step 5: Solve for x
    x = 4,139,480.38/2,999.88
  6. Step 6: Final answer
    x = 1,379.88

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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.