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Finding the Fourth Proportional to 13,617.80, 18,791.86 and 7,649.72

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Solution

The fourth proportional to 13,617.80, 18,791.86 and 7,649.72 is: 10,556.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,617.80 : 18,791.86 = 7,649.72 : x
  2. Step 2: Convert to fraction form
    13,617.80/18,791.86 = 7,649.72/x
  3. Step 3: Cross multiply
    13,617.80x = 18,791.86 × 7,649.72
  4. Step 4: Simplify right side
    13,617.80x = 143,752,467.28
  5. Step 5: Solve for x
    x = 143,752,467.28/13,617.80
  6. Step 6: Final answer
    x = 10,556.22

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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.