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Finding the Fourth Proportional to 11,486.92, 15,857.98 and 7,729.84

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Solution

The fourth proportional to 11,486.92, 15,857.98 and 7,729.84 is: 10,671.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,486.92 : 15,857.98 = 7,729.84 : x
  2. Step 2: Convert to fraction form
    11,486.92/15,857.98 = 7,729.84/x
  3. Step 3: Cross multiply
    11,486.92x = 15,857.98 × 7,729.84
  4. Step 4: Simplify right side
    11,486.92x = 122,579,648.12
  5. Step 5: Solve for x
    x = 122,579,648.12/11,486.92
  6. Step 6: Final answer
    x = 10,671.24

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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.