Home / 21,120.36-28,990.80-18,676.77

Finding the Fourth Proportional to 21,120.36, 28,990.80 and 18,676.77

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Solution

The fourth proportional to 21,120.36, 28,990.80 and 18,676.77 is: 25,636.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.36 : 28,990.80 = 18,676.77 : x
  2. Step 2: Convert to fraction form
    21,120.36/28,990.80 = 18,676.77/x
  3. Step 3: Cross multiply
    21,120.36x = 28,990.80 × 18,676.77
  4. Step 4: Simplify right side
    21,120.36x = 541,454,503.72
  5. Step 5: Solve for x
    x = 541,454,503.72/21,120.36
  6. Step 6: Final answer
    x = 25,636.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.