Home / 21,731.96-29,979.96-12,779.30

Finding the Fourth Proportional to 21,731.96, 29,979.96 and 12,779.30

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Solution

The fourth proportional to 21,731.96, 29,979.96 and 12,779.30 is: 17,629.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,731.96 : 29,979.96 = 12,779.30 : x
  2. Step 2: Convert to fraction form
    21,731.96/29,979.96 = 12,779.30/x
  3. Step 3: Cross multiply
    21,731.96x = 29,979.96 × 12,779.30
  4. Step 4: Simplify right side
    21,731.96x = 383,122,902.83
  5. Step 5: Solve for x
    x = 383,122,902.83/21,731.96
  6. Step 6: Final answer
    x = 17,629.47

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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.