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Finding the Fourth Proportional to 12,671.40, 18,991.68 and 8,974.68

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Solution

The fourth proportional to 12,671.40, 18,991.68 and 8,974.68 is: 13,451.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,671.40 : 18,991.68 = 8,974.68 : x
  2. Step 2: Convert to fraction form
    12,671.40/18,991.68 = 8,974.68/x
  3. Step 3: Cross multiply
    12,671.40x = 18,991.68 × 8,974.68
  4. Step 4: Simplify right side
    12,671.40x = 170,444,250.66
  5. Step 5: Solve for x
    x = 170,444,250.66/12,671.40
  6. Step 6: Final answer
    x = 13,451.10

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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.