Home / 20,889.78-28,811.07-18,366.54

Finding the Fourth Proportional to 20,889.78, 28,811.07 and 18,366.54

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Solution

The fourth proportional to 20,889.78, 28,811.07 and 18,366.54 is: 25,331.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,889.78 : 28,811.07 = 18,366.54 : x
  2. Step 2: Convert to fraction form
    20,889.78/28,811.07 = 18,366.54/x
  3. Step 3: Cross multiply
    20,889.78x = 28,811.07 × 18,366.54
  4. Step 4: Simplify right side
    20,889.78x = 529,159,669.60
  5. Step 5: Solve for x
    x = 529,159,669.60/20,889.78
  6. Step 6: Final answer
    x = 25,331.03

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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.