Home / 13,620.63-20,420.80-5,725.46

Finding the Fourth Proportional to 13,620.63, 20,420.80 and 5,725.46

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Solution

The fourth proportional to 13,620.63, 20,420.80 and 5,725.46 is: 8,583.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,620.63 : 20,420.80 = 5,725.46 : x
  2. Step 2: Convert to fraction form
    13,620.63/20,420.80 = 5,725.46/x
  3. Step 3: Cross multiply
    13,620.63x = 20,420.80 × 5,725.46
  4. Step 4: Simplify right side
    13,620.63x = 116,918,357.15
  5. Step 5: Solve for x
    x = 116,918,357.15/13,620.63
  6. Step 6: Final answer
    x = 8,583.92

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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.