Home / 13,749.47-18,975.81-7,781.52

Finding the Fourth Proportional to 13,749.47, 18,975.81 and 7,781.52

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Solution

The fourth proportional to 13,749.47, 18,975.81 and 7,781.52 is: 10,739.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,749.47 : 18,975.81 = 7,781.52 : x
  2. Step 2: Convert to fraction form
    13,749.47/18,975.81 = 7,781.52/x
  3. Step 3: Cross multiply
    13,749.47x = 18,975.81 × 7,781.52
  4. Step 4: Simplify right side
    13,749.47x = 147,660,645.03
  5. Step 5: Solve for x
    x = 147,660,645.03/13,749.47
  6. Step 6: Final answer
    x = 10,739.37

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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.