Home / 9,911.20-13,662.48-6,178.72

Finding the Fourth Proportional to 9,911.20, 13,662.48 and 6,178.72

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Solution

The fourth proportional to 9,911.20, 13,662.48 and 6,178.72 is: 8,517.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,911.20 : 13,662.48 = 6,178.72 : x
  2. Step 2: Convert to fraction form
    9,911.20/13,662.48 = 6,178.72/x
  3. Step 3: Cross multiply
    9,911.20x = 13,662.48 × 6,178.72
  4. Step 4: Simplify right side
    9,911.20x = 84,416,638.43
  5. Step 5: Solve for x
    x = 84,416,638.43/9,911.20
  6. Step 6: Final answer
    x = 8,517.30

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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.