Home / 20,991.85-28,970.79-15,677.44

Finding the Fourth Proportional to 20,991.85, 28,970.79 and 15,677.44

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Solution

The fourth proportional to 20,991.85, 28,970.79 and 15,677.44 is: 21,636.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.85 : 28,970.79 = 15,677.44 : x
  2. Step 2: Convert to fraction form
    20,991.85/28,970.79 = 15,677.44/x
  3. Step 3: Cross multiply
    20,991.85x = 28,970.79 × 15,677.44
  4. Step 4: Simplify right side
    20,991.85x = 454,187,821.98
  5. Step 5: Solve for x
    x = 454,187,821.98/20,991.85
  6. Step 6: Final answer
    x = 21,636.39

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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.