Home / 20,991.29-28,968.36-11,431.46

Finding the Fourth Proportional to 20,991.29, 28,968.36 and 11,431.46

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Solution

The fourth proportional to 20,991.29, 28,968.36 and 11,431.46 is: 15,775.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.29 : 28,968.36 = 11,431.46 : x
  2. Step 2: Convert to fraction form
    20,991.29/28,968.36 = 11,431.46/x
  3. Step 3: Cross multiply
    20,991.29x = 28,968.36 × 11,431.46
  4. Step 4: Simplify right side
    20,991.29x = 331,150,503.76
  5. Step 5: Solve for x
    x = 331,150,503.76/20,991.29
  6. Step 6: Final answer
    x = 15,775.62

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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.