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Finding the Fourth Proportional to 7,138.32, 9,850.89 and 3,994.50

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Solution

The fourth proportional to 7,138.32, 9,850.89 and 3,994.50 is: 5,512.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,138.32 : 9,850.89 = 3,994.50 : x
  2. Step 2: Convert to fraction form
    7,138.32/9,850.89 = 3,994.50/x
  3. Step 3: Cross multiply
    7,138.32x = 9,850.89 × 3,994.50
  4. Step 4: Simplify right side
    7,138.32x = 39,349,380.11
  5. Step 5: Solve for x
    x = 39,349,380.11/7,138.32
  6. Step 6: Final answer
    x = 5,512.41

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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.