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Finding the Fourth Proportional to 21,980.40, 32,994.90 and 13,669.80

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Solution

The fourth proportional to 21,980.40, 32,994.90 and 13,669.80 is: 20,519.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,980.40 : 32,994.90 = 13,669.80 : x
  2. Step 2: Convert to fraction form
    21,980.40/32,994.90 = 13,669.80/x
  3. Step 3: Cross multiply
    21,980.40x = 32,994.90 × 13,669.80
  4. Step 4: Simplify right side
    21,980.40x = 451,033,684.02
  5. Step 5: Solve for x
    x = 451,033,684.02/21,980.40
  6. Step 6: Final answer
    x = 20,519.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.