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Finding the Fourth Proportional to 8,687.95, 11,997.90 and 7,421.63

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Solution

The fourth proportional to 8,687.95, 11,997.90 and 7,421.63 is: 10,249.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,687.95 : 11,997.90 = 7,421.63 : x
  2. Step 2: Convert to fraction form
    8,687.95/11,997.90 = 7,421.63/x
  3. Step 3: Cross multiply
    8,687.95x = 11,997.90 × 7,421.63
  4. Step 4: Simplify right side
    8,687.95x = 89,043,914.59
  5. Step 5: Solve for x
    x = 89,043,914.59/8,687.95
  6. Step 6: Final answer
    x = 10,249.13

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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.