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Finding the Fourth Proportional to 3,408.29, 5,112.65 and 909.43

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Solution

The fourth proportional to 3,408.29, 5,112.65 and 909.43 is: 1,364.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,408.29 : 5,112.65 = 909.43 : x
  2. Step 2: Convert to fraction form
    3,408.29/5,112.65 = 909.43/x
  3. Step 3: Cross multiply
    3,408.29x = 5,112.65 × 909.43
  4. Step 4: Simplify right side
    3,408.29x = 4,649,597.29
  5. Step 5: Solve for x
    x = 4,649,597.29/3,408.29
  6. Step 6: Final answer
    x = 1,364.20

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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.