Home / 20,405.31-28,161.36-13,704.89

Finding the Fourth Proportional to 20,405.31, 28,161.36 and 13,704.89

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Solution

The fourth proportional to 20,405.31, 28,161.36 and 13,704.89 is: 18,914.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,405.31 : 28,161.36 = 13,704.89 : x
  2. Step 2: Convert to fraction form
    20,405.31/28,161.36 = 13,704.89/x
  3. Step 3: Cross multiply
    20,405.31x = 28,161.36 × 13,704.89
  4. Step 4: Simplify right side
    20,405.31x = 385,948,272.53
  5. Step 5: Solve for x
    x = 385,948,272.53/20,405.31
  6. Step 6: Final answer
    x = 18,914.11

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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.