Home / 9,189.45-13,778.97-8,405.78

Finding the Fourth Proportional to 9,189.45, 13,778.97 and 8,405.78

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Solution

The fourth proportional to 9,189.45, 13,778.97 and 8,405.78 is: 12,603.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,189.45 : 13,778.97 = 8,405.78 : x
  2. Step 2: Convert to fraction form
    9,189.45/13,778.97 = 8,405.78/x
  3. Step 3: Cross multiply
    9,189.45x = 13,778.97 × 8,405.78
  4. Step 4: Simplify right side
    9,189.45x = 115,822,941.70
  5. Step 5: Solve for x
    x = 115,822,941.70/9,189.45
  6. Step 6: Final answer
    x = 12,603.90

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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.