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Finding the Fourth Proportional to 14,971.21, 20,660.78 and 8,257.05

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Solution

The fourth proportional to 14,971.21, 20,660.78 and 8,257.05 is: 11,395.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,971.21 : 20,660.78 = 8,257.05 : x
  2. Step 2: Convert to fraction form
    14,971.21/20,660.78 = 8,257.05/x
  3. Step 3: Cross multiply
    14,971.21x = 20,660.78 × 8,257.05
  4. Step 4: Simplify right side
    14,971.21x = 170,597,114.14
  5. Step 5: Solve for x
    x = 170,597,114.14/14,971.21
  6. Step 6: Final answer
    x = 11,395.01

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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.