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Finding the Fourth Proportional to 8,919.90, 12,284.49 and 8,726.18

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Solution

The fourth proportional to 8,919.90, 12,284.49 and 8,726.18 is: 12,017.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,919.90 : 12,284.49 = 8,726.18 : x
  2. Step 2: Convert to fraction form
    8,919.90/12,284.49 = 8,726.18/x
  3. Step 3: Cross multiply
    8,919.90x = 12,284.49 × 8,726.18
  4. Step 4: Simplify right side
    8,919.90x = 107,196,745.90
  5. Step 5: Solve for x
    x = 107,196,745.90/8,919.90
  6. Step 6: Final answer
    x = 12,017.71

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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.