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Finding the Fourth Proportional to 70,288.66, 105,438.39 and 20,369.44

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Solution

The fourth proportional to 70,288.66, 105,438.39 and 20,369.44 is: 30,555.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,288.66 : 105,438.39 = 20,369.44 : x
  2. Step 2: Convert to fraction form
    70,288.66/105,438.39 = 20,369.44/x
  3. Step 3: Cross multiply
    70,288.66x = 105,438.39 × 20,369.44
  4. Step 4: Simplify right side
    70,288.66x = 2,147,720,958.80
  5. Step 5: Solve for x
    x = 2,147,720,958.80/70,288.66
  6. Step 6: Final answer
    x = 30,555.72

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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.