Home / 28,379.77-39,149.21-21,653.73

Finding the Fourth Proportional to 28,379.77, 39,149.21 and 21,653.73

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Solution

The fourth proportional to 28,379.77, 39,149.21 and 21,653.73 is: 29,870.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,379.77 : 39,149.21 = 21,653.73 : x
  2. Step 2: Convert to fraction form
    28,379.77/39,149.21 = 21,653.73/x
  3. Step 3: Cross multiply
    28,379.77x = 39,149.21 × 21,653.73
  4. Step 4: Simplify right side
    28,379.77x = 847,726,477.19
  5. Step 5: Solve for x
    x = 847,726,477.19/28,379.77
  6. Step 6: Final answer
    x = 29,870.80

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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.