Home / 20,779.20-31,134.60-11,998.80

Finding the Fourth Proportional to 20,779.20, 31,134.60 and 11,998.80

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Solution

The fourth proportional to 20,779.20, 31,134.60 and 11,998.80 is: 17,978.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,779.20 : 31,134.60 = 11,998.80 : x
  2. Step 2: Convert to fraction form
    20,779.20/31,134.60 = 11,998.80/x
  3. Step 3: Cross multiply
    20,779.20x = 31,134.60 × 11,998.80
  4. Step 4: Simplify right side
    20,779.20x = 373,577,838.48
  5. Step 5: Solve for x
    x = 373,577,838.48/20,779.20
  6. Step 6: Final answer
    x = 17,978.45

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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.