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Finding the Fourth Proportional to 7,886.20, 11,813.10 and 3,992.80

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Solution

The fourth proportional to 7,886.20, 11,813.10 and 3,992.80 is: 5,981.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,886.20 : 11,813.10 = 3,992.80 : x
  2. Step 2: Convert to fraction form
    7,886.20/11,813.10 = 3,992.80/x
  3. Step 3: Cross multiply
    7,886.20x = 11,813.10 × 3,992.80
  4. Step 4: Simplify right side
    7,886.20x = 47,167,345.68
  5. Step 5: Solve for x
    x = 47,167,345.68/7,886.20
  6. Step 6: Final answer
    x = 5,981.00

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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.