Home / 13,898.20-20,840.10-5,128.60

Finding the Fourth Proportional to 13,898.20, 20,840.10 and 5,128.60

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Solution

The fourth proportional to 13,898.20, 20,840.10 and 5,128.60 is: 7,690.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,898.20 : 20,840.10 = 5,128.60 : x
  2. Step 2: Convert to fraction form
    13,898.20/20,840.10 = 5,128.60/x
  3. Step 3: Cross multiply
    13,898.20x = 20,840.10 × 5,128.60
  4. Step 4: Simplify right side
    13,898.20x = 106,880,536.86
  5. Step 5: Solve for x
    x = 106,880,536.86/13,898.20
  6. Step 6: Final answer
    x = 7,690.24

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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.