Home / 18,738.67-28,120.74-9,979.72

Finding the Fourth Proportional to 18,738.67, 28,120.74 and 9,979.72

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Solution

The fourth proportional to 18,738.67, 28,120.74 and 9,979.72 is: 14,976.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,738.67 : 28,120.74 = 9,979.72 : x
  2. Step 2: Convert to fraction form
    18,738.67/28,120.74 = 9,979.72/x
  3. Step 3: Cross multiply
    18,738.67x = 28,120.74 × 9,979.72
  4. Step 4: Simplify right side
    18,738.67x = 280,637,111.39
  5. Step 5: Solve for x
    x = 280,637,111.39/18,738.67
  6. Step 6: Final answer
    x = 14,976.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.