Home / 20,999.48-28,969.05-13,439.75

Finding the Fourth Proportional to 20,999.48, 28,969.05 and 13,439.75

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Solution

The fourth proportional to 20,999.48, 28,969.05 and 13,439.75 is: 18,540.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.48 : 28,969.05 = 13,439.75 : x
  2. Step 2: Convert to fraction form
    20,999.48/28,969.05 = 13,439.75/x
  3. Step 3: Cross multiply
    20,999.48x = 28,969.05 × 13,439.75
  4. Step 4: Simplify right side
    20,999.48x = 389,336,644.89
  5. Step 5: Solve for x
    x = 389,336,644.89/20,999.48
  6. Step 6: Final answer
    x = 18,540.30

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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.