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Finding the Fourth Proportional to 12,659.98, 18,989.90 and 5,163.52

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Solution

The fourth proportional to 12,659.98, 18,989.90 and 5,163.52 is: 7,745.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,659.98 : 18,989.90 = 5,163.52 : x
  2. Step 2: Convert to fraction form
    12,659.98/18,989.90 = 5,163.52/x
  3. Step 3: Cross multiply
    12,659.98x = 18,989.90 × 5,163.52
  4. Step 4: Simplify right side
    12,659.98x = 98,054,728.45
  5. Step 5: Solve for x
    x = 98,054,728.45/12,659.98
  6. Step 6: Final answer
    x = 7,745.25

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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.