Home / 21,268.65-31,879.47-8,781.79

Finding the Fourth Proportional to 21,268.65, 31,879.47 and 8,781.79

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Solution

The fourth proportional to 21,268.65, 31,879.47 and 8,781.79 is: 13,162.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,268.65 : 31,879.47 = 8,781.79 : x
  2. Step 2: Convert to fraction form
    21,268.65/31,879.47 = 8,781.79/x
  3. Step 3: Cross multiply
    21,268.65x = 31,879.47 × 8,781.79
  4. Step 4: Simplify right side
    21,268.65x = 279,958,810.85
  5. Step 5: Solve for x
    x = 279,958,810.85/21,268.65
  6. Step 6: Final answer
    x = 13,162.98

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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.