Home / 28,971.24-39,979.86-15,723.24

Finding the Fourth Proportional to 28,971.24, 39,979.86 and 15,723.24

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Solution

The fourth proportional to 28,971.24, 39,979.86 and 15,723.24 is: 21,697.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,971.24 : 39,979.86 = 15,723.24 : x
  2. Step 2: Convert to fraction form
    28,971.24/39,979.86 = 15,723.24/x
  3. Step 3: Cross multiply
    28,971.24x = 39,979.86 × 15,723.24
  4. Step 4: Simplify right side
    28,971.24x = 628,612,933.95
  5. Step 5: Solve for x
    x = 628,612,933.95/28,971.24
  6. Step 6: Final answer
    x = 21,697.83

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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.