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Finding the Fourth Proportional to 12,940.88, 19,416.18 and 7,750.40

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Solution

The fourth proportional to 12,940.88, 19,416.18 and 7,750.40 is: 11,628.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,940.88 : 19,416.18 = 7,750.40 : x
  2. Step 2: Convert to fraction form
    12,940.88/19,416.18 = 7,750.40/x
  3. Step 3: Cross multiply
    12,940.88x = 19,416.18 × 7,750.40
  4. Step 4: Simplify right side
    12,940.88x = 150,483,161.47
  5. Step 5: Solve for x
    x = 150,483,161.47/12,940.88
  6. Step 6: Final answer
    x = 11,628.51

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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.