Home / 28,618.80-39,474.13-20,138.70

Finding the Fourth Proportional to 28,618.80, 39,474.13 and 20,138.70

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Solution

The fourth proportional to 28,618.80, 39,474.13 and 20,138.70 is: 27,777.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,618.80 : 39,474.13 = 20,138.70 : x
  2. Step 2: Convert to fraction form
    28,618.80/39,474.13 = 20,138.70/x
  3. Step 3: Cross multiply
    28,618.80x = 39,474.13 × 20,138.70
  4. Step 4: Simplify right side
    28,618.80x = 794,957,661.83
  5. Step 5: Solve for x
    x = 794,957,661.83/28,618.80
  6. Step 6: Final answer
    x = 27,777.46

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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.