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Finding the Fourth Proportional to 18,722.76, 28,076.34 and 7,621.94

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Solution

The fourth proportional to 18,722.76, 28,076.34 and 7,621.94 is: 11,429.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,722.76 : 28,076.34 = 7,621.94 : x
  2. Step 2: Convert to fraction form
    18,722.76/28,076.34 = 7,621.94/x
  3. Step 3: Cross multiply
    18,722.76x = 28,076.34 × 7,621.94
  4. Step 4: Simplify right side
    18,722.76x = 213,996,178.90
  5. Step 5: Solve for x
    x = 213,996,178.90/18,722.76
  6. Step 6: Final answer
    x = 11,429.73

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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.