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Finding the Fourth Proportional to 8,647.75, 12,996 and 5,138.43

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Solution

The fourth proportional to 8,647.75, 12,996 and 5,138.43 is: 7,722.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,647.75 : 12,996 = 5,138.43 : x
  2. Step 2: Convert to fraction form
    8,647.75/12,996 = 5,138.43/x
  3. Step 3: Cross multiply
    8,647.75x = 12,996 × 5,138.43
  4. Step 4: Simplify right side
    8,647.75x = 66,779,036.28
  5. Step 5: Solve for x
    x = 66,779,036.28/8,647.75
  6. Step 6: Final answer
    x = 7,722.13

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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.