Home / 18,806.40-25,977.60-15,678.72

Finding the Fourth Proportional to 18,806.40, 25,977.60 and 15,678.72

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Solution

The fourth proportional to 18,806.40, 25,977.60 and 15,678.72 is: 21,657.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,806.40 : 25,977.60 = 15,678.72 : x
  2. Step 2: Convert to fraction form
    18,806.40/25,977.60 = 15,678.72/x
  3. Step 3: Cross multiply
    18,806.40x = 25,977.60 × 15,678.72
  4. Step 4: Simplify right side
    18,806.40x = 407,295,516.67
  5. Step 5: Solve for x
    x = 407,295,516.67/18,806.40
  6. Step 6: Final answer
    x = 21,657.28

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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.