Home / 20,704.07-31,016.01-12,390.64

Finding the Fourth Proportional to 20,704.07, 31,016.01 and 12,390.64

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Solution

The fourth proportional to 20,704.07, 31,016.01 and 12,390.64 is: 18,561.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,704.07 : 31,016.01 = 12,390.64 : x
  2. Step 2: Convert to fraction form
    20,704.07/31,016.01 = 12,390.64/x
  3. Step 3: Cross multiply
    20,704.07x = 31,016.01 × 12,390.64
  4. Step 4: Simplify right side
    20,704.07x = 384,308,214.15
  5. Step 5: Solve for x
    x = 384,308,214.15/20,704.07
  6. Step 6: Final answer
    x = 18,561.96

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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.