Home / 13,708.20-18,917.40-7,420.60

Finding the Fourth Proportional to 13,708.20, 18,917.40 and 7,420.60

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Solution

The fourth proportional to 13,708.20, 18,917.40 and 7,420.60 is: 10,240.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,708.20 : 18,917.40 = 7,420.60 : x
  2. Step 2: Convert to fraction form
    13,708.20/18,917.40 = 7,420.60/x
  3. Step 3: Cross multiply
    13,708.20x = 18,917.40 × 7,420.60
  4. Step 4: Simplify right side
    13,708.20x = 140,378,458.44
  5. Step 5: Solve for x
    x = 140,378,458.44/13,708.20
  6. Step 6: Final answer
    x = 10,240.47

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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.