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Finding the Fourth Proportional to 7,321.72, 10,105.50 and 6,731.32

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Solution

The fourth proportional to 7,321.72, 10,105.50 and 6,731.32 is: 9,290.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,321.72 : 10,105.50 = 6,731.32 : x
  2. Step 2: Convert to fraction form
    7,321.72/10,105.50 = 6,731.32/x
  3. Step 3: Cross multiply
    7,321.72x = 10,105.50 × 6,731.32
  4. Step 4: Simplify right side
    7,321.72x = 68,023,354.26
  5. Step 5: Solve for x
    x = 68,023,354.26/7,321.72
  6. Step 6: Final answer
    x = 9,290.62

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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.