Home / 20,919.96-28,855.98-13,368.60

Finding the Fourth Proportional to 20,919.96, 28,855.98 and 13,368.60

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Solution

The fourth proportional to 20,919.96, 28,855.98 and 13,368.60 is: 18,440.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.96 : 28,855.98 = 13,368.60 : x
  2. Step 2: Convert to fraction form
    20,919.96/28,855.98 = 13,368.60/x
  3. Step 3: Cross multiply
    20,919.96x = 28,855.98 × 13,368.60
  4. Step 4: Simplify right side
    20,919.96x = 385,764,054.23
  5. Step 5: Solve for x
    x = 385,764,054.23/20,919.96
  6. Step 6: Final answer
    x = 18,440.00

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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.