Home / 20,918.21-28,865.34-11,964.28

Finding the Fourth Proportional to 20,918.21, 28,865.34 and 11,964.28

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Solution

The fourth proportional to 20,918.21, 28,865.34 and 11,964.28 is: 16,509.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.21 : 28,865.34 = 11,964.28 : x
  2. Step 2: Convert to fraction form
    20,918.21/28,865.34 = 11,964.28/x
  3. Step 3: Cross multiply
    20,918.21x = 28,865.34 × 11,964.28
  4. Step 4: Simplify right side
    20,918.21x = 345,352,865.73
  5. Step 5: Solve for x
    x = 345,352,865.73/20,918.21
  6. Step 6: Final answer
    x = 16,509.68

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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.