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Finding the Fourth Proportional to 71,324.60, 106,986.90 and 18,739.40

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Solution

The fourth proportional to 71,324.60, 106,986.90 and 18,739.40 is: 28,109.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,324.60 : 106,986.90 = 18,739.40 : x
  2. Step 2: Convert to fraction form
    71,324.60/106,986.90 = 18,739.40/x
  3. Step 3: Cross multiply
    71,324.60x = 106,986.90 × 18,739.40
  4. Step 4: Simplify right side
    71,324.60x = 2,004,870,313.86
  5. Step 5: Solve for x
    x = 2,004,870,313.86/71,324.60
  6. Step 6: Final answer
    x = 28,109.10

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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.