Home / 20,409.87-28,163.70-11,455.63

Finding the Fourth Proportional to 20,409.87, 28,163.70 and 11,455.63

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Solution

The fourth proportional to 20,409.87, 28,163.70 and 11,455.63 is: 15,807.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,409.87 : 28,163.70 = 11,455.63 : x
  2. Step 2: Convert to fraction form
    20,409.87/28,163.70 = 11,455.63/x
  3. Step 3: Cross multiply
    20,409.87x = 28,163.70 × 11,455.63
  4. Step 4: Simplify right side
    20,409.87x = 322,632,856.22
  5. Step 5: Solve for x
    x = 322,632,856.22/20,409.87
  6. Step 6: Final answer
    x = 15,807.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.