Home / 20,779.80-31,169.70-19,321.80

Finding the Fourth Proportional to 20,779.80, 31,169.70 and 19,321.80

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Solution

The fourth proportional to 20,779.80, 31,169.70 and 19,321.80 is: 28,982.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,779.80 : 31,169.70 = 19,321.80 : x
  2. Step 2: Convert to fraction form
    20,779.80/31,169.70 = 19,321.80/x
  3. Step 3: Cross multiply
    20,779.80x = 31,169.70 × 19,321.80
  4. Step 4: Simplify right side
    20,779.80x = 602,254,709.46
  5. Step 5: Solve for x
    x = 602,254,709.46/20,779.80
  6. Step 6: Final answer
    x = 28,982.70

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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.