Home / 20,991.28-28,970.01-15,676.87

Finding the Fourth Proportional to 20,991.28, 28,970.01 and 15,676.87

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Solution

The fourth proportional to 20,991.28, 28,970.01 and 15,676.87 is: 21,635.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.28 : 28,970.01 = 15,676.87 : x
  2. Step 2: Convert to fraction form
    20,991.28/28,970.01 = 15,676.87/x
  3. Step 3: Cross multiply
    20,991.28x = 28,970.01 × 15,676.87
  4. Step 4: Simplify right side
    20,991.28x = 454,159,080.67
  5. Step 5: Solve for x
    x = 454,159,080.67/20,991.28
  6. Step 6: Final answer
    x = 21,635.61

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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.