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Finding the Fourth Proportional to 20,515.60, 30,708.60 and 16,109.20

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Solution

The fourth proportional to 20,515.60, 30,708.60 and 16,109.20 is: 24,112.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,515.60 : 30,708.60 = 16,109.20 : x
  2. Step 2: Convert to fraction form
    20,515.60/30,708.60 = 16,109.20/x
  3. Step 3: Cross multiply
    20,515.60x = 30,708.60 × 16,109.20
  4. Step 4: Simplify right side
    20,515.60x = 494,690,979.12
  5. Step 5: Solve for x
    x = 494,690,979.12/20,515.60
  6. Step 6: Final answer
    x = 24,112.92

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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.