Home / 20,991.24-28,970.01-15,676.83

Finding the Fourth Proportional to 20,991.24, 28,970.01 and 15,676.83

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Solution

The fourth proportional to 20,991.24, 28,970.01 and 15,676.83 is: 21,635.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.24 : 28,970.01 = 15,676.83 : x
  2. Step 2: Convert to fraction form
    20,991.24/28,970.01 = 15,676.83/x
  3. Step 3: Cross multiply
    20,991.24x = 28,970.01 × 15,676.83
  4. Step 4: Simplify right side
    20,991.24x = 454,157,921.87
  5. Step 5: Solve for x
    x = 454,157,921.87/20,991.24
  6. Step 6: Final answer
    x = 21,635.59

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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.