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Finding the Fourth Proportional to 18,700.25, 27,979.74 and 10,386.21

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Solution

The fourth proportional to 18,700.25, 27,979.74 and 10,386.21 is: 15,540.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,700.25 : 27,979.74 = 10,386.21 : x
  2. Step 2: Convert to fraction form
    18,700.25/27,979.74 = 10,386.21/x
  3. Step 3: Cross multiply
    18,700.25x = 27,979.74 × 10,386.21
  4. Step 4: Simplify right side
    18,700.25x = 290,603,455.39
  5. Step 5: Solve for x
    x = 290,603,455.39/18,700.25
  6. Step 6: Final answer
    x = 15,540.09

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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.