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Finding the Fourth Proportional to 14,971.21, 20,660.43 and 8,257.12

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Solution

The fourth proportional to 14,971.21, 20,660.43 and 8,257.12 is: 11,394.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,971.21 : 20,660.43 = 8,257.12 : x
  2. Step 2: Convert to fraction form
    14,971.21/20,660.43 = 8,257.12/x
  3. Step 3: Cross multiply
    14,971.21x = 20,660.43 × 8,257.12
  4. Step 4: Simplify right side
    14,971.21x = 170,595,649.76
  5. Step 5: Solve for x
    x = 170,595,649.76/14,971.21
  6. Step 6: Final answer
    x = 11,394.91

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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.