Home / 21,147.20-31,720.80-10,779.20

Finding the Fourth Proportional to 21,147.20, 31,720.80 and 10,779.20

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Solution

The fourth proportional to 21,147.20, 31,720.80 and 10,779.20 is: 16,168.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,147.20 : 31,720.80 = 10,779.20 : x
  2. Step 2: Convert to fraction form
    21,147.20/31,720.80 = 10,779.20/x
  3. Step 3: Cross multiply
    21,147.20x = 31,720.80 × 10,779.20
  4. Step 4: Simplify right side
    21,147.20x = 341,924,847.36
  5. Step 5: Solve for x
    x = 341,924,847.36/21,147.20
  6. Step 6: Final answer
    x = 16,168.80

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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.