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Finding the Fourth Proportional to 8,621.72, 11,893.90 and 7,376.15

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Solution

The fourth proportional to 8,621.72, 11,893.90 and 7,376.15 is: 10,175.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,621.72 : 11,893.90 = 7,376.15 : x
  2. Step 2: Convert to fraction form
    8,621.72/11,893.90 = 7,376.15/x
  3. Step 3: Cross multiply
    8,621.72x = 11,893.90 × 7,376.15
  4. Step 4: Simplify right side
    8,621.72x = 87,731,190.49
  5. Step 5: Solve for x
    x = 87,731,190.49/8,621.72
  6. Step 6: Final answer
    x = 10,175.60

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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.