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Finding the Fourth Proportional to 12,671.60, 18,991.83 and 7,113.29

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Solution

The fourth proportional to 12,671.60, 18,991.83 and 7,113.29 is: 10,661.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,671.60 : 18,991.83 = 7,113.29 : x
  2. Step 2: Convert to fraction form
    12,671.60/18,991.83 = 7,113.29/x
  3. Step 3: Cross multiply
    12,671.60x = 18,991.83 × 7,113.29
  4. Step 4: Simplify right side
    12,671.60x = 135,094,394.42
  5. Step 5: Solve for x
    x = 135,094,394.42/12,671.60
  6. Step 6: Final answer
    x = 10,661.19

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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.