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Finding the Fourth Proportional to 8,681.13, 11,999.64 and 7,992.21

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Solution

The fourth proportional to 8,681.13, 11,999.64 and 7,992.21 is: 11,047.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,681.13 : 11,999.64 = 7,992.21 : x
  2. Step 2: Convert to fraction form
    8,681.13/11,999.64 = 7,992.21/x
  3. Step 3: Cross multiply
    8,681.13x = 11,999.64 × 7,992.21
  4. Step 4: Simplify right side
    8,681.13x = 95,903,642.80
  5. Step 5: Solve for x
    x = 95,903,642.80/8,681.13
  6. Step 6: Final answer
    x = 11,047.37

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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.