Home / 20,722.78-31,083.94-12,405.12

Finding the Fourth Proportional to 20,722.78, 31,083.94 and 12,405.12

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Solution

The fourth proportional to 20,722.78, 31,083.94 and 12,405.12 is: 18,607.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,722.78 : 31,083.94 = 12,405.12 : x
  2. Step 2: Convert to fraction form
    20,722.78/31,083.94 = 12,405.12/x
  3. Step 3: Cross multiply
    20,722.78x = 31,083.94 × 12,405.12
  4. Step 4: Simplify right side
    20,722.78x = 385,600,005.77
  5. Step 5: Solve for x
    x = 385,600,005.77/20,722.78
  6. Step 6: Final answer
    x = 18,607.54

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1.5x scale

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.