Home / 13,137.20-19,705.80-8,212.40

Finding the Fourth Proportional to 13,137.20, 19,705.80 and 8,212.40

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Solution

The fourth proportional to 13,137.20, 19,705.80 and 8,212.40 is: 12,318.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,137.20 : 19,705.80 = 8,212.40 : x
  2. Step 2: Convert to fraction form
    13,137.20/19,705.80 = 8,212.40/x
  3. Step 3: Cross multiply
    13,137.20x = 19,705.80 × 8,212.40
  4. Step 4: Simplify right side
    13,137.20x = 161,831,911.92
  5. Step 5: Solve for x
    x = 161,831,911.92/13,137.20
  6. Step 6: Final answer
    x = 12,318.60

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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.