Home / 20,918.88-28,868.25-11,487.64

Finding the Fourth Proportional to 20,918.88, 28,868.25 and 11,487.64

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Solution

The fourth proportional to 20,918.88, 28,868.25 and 11,487.64 is: 15,853.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.88 : 28,868.25 = 11,487.64 : x
  2. Step 2: Convert to fraction form
    20,918.88/28,868.25 = 11,487.64/x
  3. Step 3: Cross multiply
    20,918.88x = 28,868.25 × 11,487.64
  4. Step 4: Simplify right side
    20,918.88x = 331,628,063.43
  5. Step 5: Solve for x
    x = 331,628,063.43/20,918.88
  6. Step 6: Final answer
    x = 15,853.05

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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.