Home / 15,779.38-21,778.36-9,406.37

Finding the Fourth Proportional to 15,779.38, 21,778.36 and 9,406.37

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Solution

The fourth proportional to 15,779.38, 21,778.36 and 9,406.37 is: 12,982.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,779.38 : 21,778.36 = 9,406.37 : x
  2. Step 2: Convert to fraction form
    15,779.38/21,778.36 = 9,406.37/x
  3. Step 3: Cross multiply
    15,779.38x = 21,778.36 × 9,406.37
  4. Step 4: Simplify right side
    15,779.38x = 204,855,367.40
  5. Step 5: Solve for x
    x = 204,855,367.40/15,779.38
  6. Step 6: Final answer
    x = 12,982.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.