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Finding the Fourth Proportional to 15,930.21, 21,984.44 and 8,856.75

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Solution

The fourth proportional to 15,930.21, 21,984.44 and 8,856.75 is: 12,222.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,930.21 : 21,984.44 = 8,856.75 : x
  2. Step 2: Convert to fraction form
    15,930.21/21,984.44 = 8,856.75/x
  3. Step 3: Cross multiply
    15,930.21x = 21,984.44 × 8,856.75
  4. Step 4: Simplify right side
    15,930.21x = 194,710,688.97
  5. Step 5: Solve for x
    x = 194,710,688.97/15,930.21
  6. Step 6: Final answer
    x = 12,222.73

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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.