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Finding the Fourth Proportional to 20,535.80, 30,803.70 and 12,662.60

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Solution

The fourth proportional to 20,535.80, 30,803.70 and 12,662.60 is: 18,993.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,535.80 : 30,803.70 = 12,662.60 : x
  2. Step 2: Convert to fraction form
    20,535.80/30,803.70 = 12,662.60/x
  3. Step 3: Cross multiply
    20,535.80x = 30,803.70 × 12,662.60
  4. Step 4: Simplify right side
    20,535.80x = 390,054,931.62
  5. Step 5: Solve for x
    x = 390,054,931.62/20,535.80
  6. Step 6: Final answer
    x = 18,993.90

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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.