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Finding the Fourth Proportional to 12,138, 16,745.64 and 7,660.32

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Solution

The fourth proportional to 12,138, 16,745.64 and 7,660.32 is: 10,568.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,138 : 16,745.64 = 7,660.32 : x
  2. Step 2: Convert to fraction form
    12,138/16,745.64 = 7,660.32/x
  3. Step 3: Cross multiply
    12,138x = 16,745.64 × 7,660.32
  4. Step 4: Simplify right side
    12,138x = 128,276,961.00
  5. Step 5: Solve for x
    x = 128,276,961.00/12,138
  6. Step 6: Final answer
    x = 10,568.21

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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.