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Finding the Fourth Proportional to 8,661.28, 12,995.76 and 3,188

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Solution

The fourth proportional to 8,661.28, 12,995.76 and 3,188 is: 4,783.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,661.28 : 12,995.76 = 3,188 : x
  2. Step 2: Convert to fraction form
    8,661.28/12,995.76 = 3,188/x
  3. Step 3: Cross multiply
    8,661.28x = 12,995.76 × 3,188
  4. Step 4: Simplify right side
    8,661.28x = 41,430,482.88
  5. Step 5: Solve for x
    x = 41,430,482.88/8,661.28
  6. Step 6: Final answer
    x = 4,783.41

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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.