Home / 18,979.12-28,469.90-7,886.71

Finding the Fourth Proportional to 18,979.12, 28,469.90 and 7,886.71

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Solution

The fourth proportional to 18,979.12, 28,469.90 and 7,886.71 is: 11,830.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,979.12 : 28,469.90 = 7,886.71 : x
  2. Step 2: Convert to fraction form
    18,979.12/28,469.90 = 7,886.71/x
  3. Step 3: Cross multiply
    18,979.12x = 28,469.90 × 7,886.71
  4. Step 4: Simplify right side
    18,979.12x = 224,533,845.03
  5. Step 5: Solve for x
    x = 224,533,845.03/18,979.12
  6. Step 6: Final answer
    x = 11,830.57

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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.