Home / 28,969.13-39,977.39-15,721.13

Finding the Fourth Proportional to 28,969.13, 39,977.39 and 15,721.13

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Solution

The fourth proportional to 28,969.13, 39,977.39 and 15,721.13 is: 21,695.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,969.13 : 39,977.39 = 15,721.13 : x
  2. Step 2: Convert to fraction form
    28,969.13/39,977.39 = 15,721.13/x
  3. Step 3: Cross multiply
    28,969.13x = 39,977.39 × 15,721.13
  4. Step 4: Simplify right side
    28,969.13x = 628,489,584.67
  5. Step 5: Solve for x
    x = 628,489,584.67/28,969.13
  6. Step 6: Final answer
    x = 21,695.15

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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.