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Finding the Fourth Proportional to 20,674.44, 30,980.88 and 8,981.28

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Solution

The fourth proportional to 20,674.44, 30,980.88 and 8,981.28 is: 13,458.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,674.44 : 30,980.88 = 8,981.28 : x
  2. Step 2: Convert to fraction form
    20,674.44/30,980.88 = 8,981.28/x
  3. Step 3: Cross multiply
    20,674.44x = 30,980.88 × 8,981.28
  4. Step 4: Simplify right side
    20,674.44x = 278,247,957.93
  5. Step 5: Solve for x
    x = 278,247,957.93/20,674.44
  6. Step 6: Final answer
    x = 13,458.55

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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.