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Finding the Fourth Proportional to 31,795.20, 43,891.20 and 20,620.80

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Solution

The fourth proportional to 31,795.20, 43,891.20 and 20,620.80 is: 28,465.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,795.20 : 43,891.20 = 20,620.80 : x
  2. Step 2: Convert to fraction form
    31,795.20/43,891.20 = 20,620.80/x
  3. Step 3: Cross multiply
    31,795.20x = 43,891.20 × 20,620.80
  4. Step 4: Simplify right side
    31,795.20x = 905,071,656.96
  5. Step 5: Solve for x
    x = 905,071,656.96/31,795.20
  6. Step 6: Final answer
    x = 28,465.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.