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Finding the Fourth Proportional to 20,991.68, 28,970.88 and 13,041.44

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Solution

The fourth proportional to 20,991.68, 28,970.88 and 13,041.44 is: 17,998.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.68 : 28,970.88 = 13,041.44 : x
  2. Step 2: Convert to fraction form
    20,991.68/28,970.88 = 13,041.44/x
  3. Step 3: Cross multiply
    20,991.68x = 28,970.88 × 13,041.44
  4. Step 4: Simplify right side
    20,991.68x = 377,821,993.27
  5. Step 5: Solve for x
    x = 377,821,993.27/20,991.68
  6. Step 6: Final answer
    x = 17,998.65

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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.