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Finding the Fourth Proportional to 12,940.80, 19,411.12 and 3,706.80

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Solution

The fourth proportional to 12,940.80, 19,411.12 and 3,706.80 is: 5,560.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,940.80 : 19,411.12 = 3,706.80 : x
  2. Step 2: Convert to fraction form
    12,940.80/19,411.12 = 3,706.80/x
  3. Step 3: Cross multiply
    12,940.80x = 19,411.12 × 3,706.80
  4. Step 4: Simplify right side
    12,940.80x = 71,953,139.62
  5. Step 5: Solve for x
    x = 71,953,139.62/12,940.80
  6. Step 6: Final answer
    x = 5,560.18

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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.