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Finding the Fourth Proportional to 8,699.97, 13,021.07 and 7,921.76

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Solution

The fourth proportional to 8,699.97, 13,021.07 and 7,921.76 is: 11,856.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,699.97 : 13,021.07 = 7,921.76 : x
  2. Step 2: Convert to fraction form
    8,699.97/13,021.07 = 7,921.76/x
  3. Step 3: Cross multiply
    8,699.97x = 13,021.07 × 7,921.76
  4. Step 4: Simplify right side
    8,699.97x = 103,149,784.43
  5. Step 5: Solve for x
    x = 103,149,784.43/8,699.97
  6. Step 6: Final answer
    x = 11,856.34

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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.