Home / 13,749.75-18,975.11-7,781.31

Finding the Fourth Proportional to 13,749.75, 18,975.11 and 7,781.31

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Solution

The fourth proportional to 13,749.75, 18,975.11 and 7,781.31 is: 10,738.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,749.75 : 18,975.11 = 7,781.31 : x
  2. Step 2: Convert to fraction form
    13,749.75/18,975.11 = 7,781.31/x
  3. Step 3: Cross multiply
    13,749.75x = 18,975.11 × 7,781.31
  4. Step 4: Simplify right side
    13,749.75x = 147,651,174.29
  5. Step 5: Solve for x
    x = 147,651,174.29/13,749.75
  6. Step 6: Final answer
    x = 10,738.46

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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.