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Finding the Fourth Proportional to 70,540.80, 105,811.20 and 21,286.40

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Solution

The fourth proportional to 70,540.80, 105,811.20 and 21,286.40 is: 31,929.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,540.80 : 105,811.20 = 21,286.40 : x
  2. Step 2: Convert to fraction form
    70,540.80/105,811.20 = 21,286.40/x
  3. Step 3: Cross multiply
    70,540.80x = 105,811.20 × 21,286.40
  4. Step 4: Simplify right side
    70,540.80x = 2,252,339,527.68
  5. Step 5: Solve for x
    x = 2,252,339,527.68/70,540.80
  6. Step 6: Final answer
    x = 31,929.60

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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.