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Finding the Fourth Proportional to 11,811.20, 17,716.80 and 7,894.40

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Solution

The fourth proportional to 11,811.20, 17,716.80 and 7,894.40 is: 11,841.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,811.20 : 17,716.80 = 7,894.40 : x
  2. Step 2: Convert to fraction form
    11,811.20/17,716.80 = 7,894.40/x
  3. Step 3: Cross multiply
    11,811.20x = 17,716.80 × 7,894.40
  4. Step 4: Simplify right side
    11,811.20x = 139,863,505.92
  5. Step 5: Solve for x
    x = 139,863,505.92/11,811.20
  6. Step 6: Final answer
    x = 11,841.60

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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.