Home / 20,806.60-31,172.10-12,015.40

Finding the Fourth Proportional to 20,806.60, 31,172.10 and 12,015.40

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Solution

The fourth proportional to 20,806.60, 31,172.10 and 12,015.40 is: 18,001.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,806.60 : 31,172.10 = 12,015.40 : x
  2. Step 2: Convert to fraction form
    20,806.60/31,172.10 = 12,015.40/x
  3. Step 3: Cross multiply
    20,806.60x = 31,172.10 × 12,015.40
  4. Step 4: Simplify right side
    20,806.60x = 374,545,250.34
  5. Step 5: Solve for x
    x = 374,545,250.34/20,806.60
  6. Step 6: Final answer
    x = 18,001.27

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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.