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Finding the Fourth Proportional to 8,782.72, 13,172.64 and 2,939.32

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Solution

The fourth proportional to 8,782.72, 13,172.64 and 2,939.32 is: 4,408.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,782.72 : 13,172.64 = 2,939.32 : x
  2. Step 2: Convert to fraction form
    8,782.72/13,172.64 = 2,939.32/x
  3. Step 3: Cross multiply
    8,782.72x = 13,172.64 × 2,939.32
  4. Step 4: Simplify right side
    8,782.72x = 38,718,604.20
  5. Step 5: Solve for x
    x = 38,718,604.20/8,782.72
  6. Step 6: Final answer
    x = 4,408.50

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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.