Home / 12,945.43-19,418.15-7,138.95

Finding the Fourth Proportional to 12,945.43, 19,418.15 and 7,138.95

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Solution

The fourth proportional to 12,945.43, 19,418.15 and 7,138.95 is: 10,708.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,945.43 : 19,418.15 = 7,138.95 : x
  2. Step 2: Convert to fraction form
    12,945.43/19,418.15 = 7,138.95/x
  3. Step 3: Cross multiply
    12,945.43x = 19,418.15 × 7,138.95
  4. Step 4: Simplify right side
    12,945.43x = 138,625,146.97
  5. Step 5: Solve for x
    x = 138,625,146.97/12,945.43
  6. Step 6: Final answer
    x = 10,708.42

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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.