Home / 21,051.97-29,039.11-15,379.79

Finding the Fourth Proportional to 21,051.97, 29,039.11 and 15,379.79

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Solution

The fourth proportional to 21,051.97, 29,039.11 and 15,379.79 is: 21,214.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,051.97 : 29,039.11 = 15,379.79 : x
  2. Step 2: Convert to fraction form
    21,051.97/29,039.11 = 15,379.79/x
  3. Step 3: Cross multiply
    21,051.97x = 29,039.11 × 15,379.79
  4. Step 4: Simplify right side
    21,051.97x = 446,615,413.59
  5. Step 5: Solve for x
    x = 446,615,413.59/21,051.97
  6. Step 6: Final answer
    x = 21,214.90

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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.