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Finding the Fourth Proportional to 12,940.70, 19,439.85 and 12,415.90

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Solution

The fourth proportional to 12,940.70, 19,439.85 and 12,415.90 is: 18,651.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,940.70 : 19,439.85 = 12,415.90 : x
  2. Step 2: Convert to fraction form
    12,940.70/19,439.85 = 12,415.90/x
  3. Step 3: Cross multiply
    12,940.70x = 19,439.85 × 12,415.90
  4. Step 4: Simplify right side
    12,940.70x = 241,363,233.62
  5. Step 5: Solve for x
    x = 241,363,233.62/12,940.70
  6. Step 6: Final answer
    x = 18,651.48

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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.