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Finding the Fourth Proportional to 15,121.36, 20,860.68 and 8,830

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Solution

The fourth proportional to 15,121.36, 20,860.68 and 8,830 is: 12,181.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,121.36 : 20,860.68 = 8,830 : x
  2. Step 2: Convert to fraction form
    15,121.36/20,860.68 = 8,830/x
  3. Step 3: Cross multiply
    15,121.36x = 20,860.68 × 8,830
  4. Step 4: Simplify right side
    15,121.36x = 184,199,804.40
  5. Step 5: Solve for x
    x = 184,199,804.40/15,121.36
  6. Step 6: Final answer
    x = 12,181.43

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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.