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Finding the Fourth Proportional to 20,139.60, 30,241.80 and 15,214.80

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Solution

The fourth proportional to 20,139.60, 30,241.80 and 15,214.80 is: 22,846.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139.60 : 30,241.80 = 15,214.80 : x
  2. Step 2: Convert to fraction form
    20,139.60/30,241.80 = 15,214.80/x
  3. Step 3: Cross multiply
    20,139.60x = 30,241.80 × 15,214.80
  4. Step 4: Simplify right side
    20,139.60x = 460,122,938.64
  5. Step 5: Solve for x
    x = 460,122,938.64/20,139.60
  6. Step 6: Final answer
    x = 22,846.68

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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.