Home / 13,749.81-18,974.47-7,781.37

Finding the Fourth Proportional to 13,749.81, 18,974.47 and 7,781.37

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Solution

The fourth proportional to 13,749.81, 18,974.47 and 7,781.37 is: 10,738.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,749.81 : 18,974.47 = 7,781.37 : x
  2. Step 2: Convert to fraction form
    13,749.81/18,974.47 = 7,781.37/x
  3. Step 3: Cross multiply
    13,749.81x = 18,974.47 × 7,781.37
  4. Step 4: Simplify right side
    13,749.81x = 147,647,332.72
  5. Step 5: Solve for x
    x = 147,647,332.72/13,749.81
  6. Step 6: Final answer
    x = 10,738.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.