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Finding the Fourth Proportional to 8,704.84, 11,992.98 and 8,290.12

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Solution

The fourth proportional to 8,704.84, 11,992.98 and 8,290.12 is: 11,421.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,704.84 : 11,992.98 = 8,290.12 : x
  2. Step 2: Convert to fraction form
    8,704.84/11,992.98 = 8,290.12/x
  3. Step 3: Cross multiply
    8,704.84x = 11,992.98 × 8,290.12
  4. Step 4: Simplify right side
    8,704.84x = 99,423,243.36
  5. Step 5: Solve for x
    x = 99,423,243.36/8,704.84
  6. Step 6: Final answer
    x = 11,421.60

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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.