Home / 5,120.54-7,679.18-1,999.79

Finding the Fourth Proportional to 5,120.54, 7,679.18 and 1,999.79

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Solution

The fourth proportional to 5,120.54, 7,679.18 and 1,999.79 is: 2,999.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,120.54 : 7,679.18 = 1,999.79 : x
  2. Step 2: Convert to fraction form
    5,120.54/7,679.18 = 1,999.79/x
  3. Step 3: Cross multiply
    5,120.54x = 7,679.18 × 1,999.79
  4. Step 4: Simplify right side
    5,120.54x = 15,356,737.37
  5. Step 5: Solve for x
    x = 15,356,737.37/5,120.54
  6. Step 6: Final answer
    x = 2,999.05

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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.