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Finding the Fourth Proportional to 20,453.60, 30,745.20 and 18,898.40

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Solution

The fourth proportional to 20,453.60, 30,745.20 and 18,898.40 is: 28,407.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,453.60 : 30,745.20 = 18,898.40 : x
  2. Step 2: Convert to fraction form
    20,453.60/30,745.20 = 18,898.40/x
  3. Step 3: Cross multiply
    20,453.60x = 30,745.20 × 18,898.40
  4. Step 4: Simplify right side
    20,453.60x = 581,035,087.68
  5. Step 5: Solve for x
    x = 581,035,087.68/20,453.60
  6. Step 6: Final answer
    x = 28,407.47

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1.5x scale

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.