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Finding the Fourth Proportional to 13,887.12, 19,163.88 and 7,918.68

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Solution

The fourth proportional to 13,887.12, 19,163.88 and 7,918.68 is: 10,927.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,887.12 : 19,163.88 = 7,918.68 : x
  2. Step 2: Convert to fraction form
    13,887.12/19,163.88 = 7,918.68/x
  3. Step 3: Cross multiply
    13,887.12x = 19,163.88 × 7,918.68
  4. Step 4: Simplify right side
    13,887.12x = 151,752,633.28
  5. Step 5: Solve for x
    x = 151,752,633.28/13,887.12
  6. Step 6: Final answer
    x = 10,927.58

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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.