Home / 20,779.35-28,638.43-15,731.48

Finding the Fourth Proportional to 20,779.35, 28,638.43 and 15,731.48

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Solution

The fourth proportional to 20,779.35, 28,638.43 and 15,731.48 is: 21,681.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,779.35 : 28,638.43 = 15,731.48 : x
  2. Step 2: Convert to fraction form
    20,779.35/28,638.43 = 15,731.48/x
  3. Step 3: Cross multiply
    20,779.35x = 28,638.43 × 15,731.48
  4. Step 4: Simplify right side
    20,779.35x = 450,524,921.04
  5. Step 5: Solve for x
    x = 450,524,921.04/20,779.35
  6. Step 6: Final answer
    x = 21,681.38

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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.