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Finding the Fourth Proportional to 8,571.40, 12,837.90 and 5,115.40

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Solution

The fourth proportional to 8,571.40, 12,837.90 and 5,115.40 is: 7,661.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,571.40 : 12,837.90 = 5,115.40 : x
  2. Step 2: Convert to fraction form
    8,571.40/12,837.90 = 5,115.40/x
  3. Step 3: Cross multiply
    8,571.40x = 12,837.90 × 5,115.40
  4. Step 4: Simplify right side
    8,571.40x = 65,670,993.66
  5. Step 5: Solve for x
    x = 65,670,993.66/8,571.40
  6. Step 6: Final answer
    x = 7,661.64

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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.