Home / 13,749.39-18,973.17-7,781.72

Finding the Fourth Proportional to 13,749.39, 18,973.17 and 7,781.72

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Solution

The fourth proportional to 13,749.39, 18,973.17 and 7,781.72 is: 10,738.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,749.39 : 18,973.17 = 7,781.72 : x
  2. Step 2: Convert to fraction form
    13,749.39/18,973.17 = 7,781.72/x
  3. Step 3: Cross multiply
    13,749.39x = 18,973.17 × 7,781.72
  4. Step 4: Simplify right side
    13,749.39x = 147,643,801.59
  5. Step 5: Solve for x
    x = 147,643,801.59/13,749.39
  6. Step 6: Final answer
    x = 10,738.21

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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.