Home / 20,779.02-31,178.25-12,021.30

Finding the Fourth Proportional to 20,779.02, 31,178.25 and 12,021.30

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Solution

The fourth proportional to 20,779.02, 31,178.25 and 12,021.30 is: 18,037.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,779.02 : 31,178.25 = 12,021.30 : x
  2. Step 2: Convert to fraction form
    20,779.02/31,178.25 = 12,021.30/x
  3. Step 3: Cross multiply
    20,779.02x = 31,178.25 × 12,021.30
  4. Step 4: Simplify right side
    20,779.02x = 374,803,096.73
  5. Step 5: Solve for x
    x = 374,803,096.73/20,779.02
  6. Step 6: Final answer
    x = 18,037.57

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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.