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Finding the Fourth Proportional to 20,512.60, 30,768.90 and 12,639.40

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Solution

The fourth proportional to 20,512.60, 30,768.90 and 12,639.40 is: 18,959.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,512.60 : 30,768.90 = 12,639.40 : x
  2. Step 2: Convert to fraction form
    20,512.60/30,768.90 = 12,639.40/x
  3. Step 3: Cross multiply
    20,512.60x = 30,768.90 × 12,639.40
  4. Step 4: Simplify right side
    20,512.60x = 388,900,434.66
  5. Step 5: Solve for x
    x = 388,900,434.66/20,512.60
  6. Step 6: Final answer
    x = 18,959.10

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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.