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Finding the Fourth Proportional to 18,671.66, 25,758.50 and 12,619.96

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Solution

The fourth proportional to 18,671.66, 25,758.50 and 12,619.96 is: 17,409.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,671.66 : 25,758.50 = 12,619.96 : x
  2. Step 2: Convert to fraction form
    18,671.66/25,758.50 = 12,619.96/x
  3. Step 3: Cross multiply
    18,671.66x = 25,758.50 × 12,619.96
  4. Step 4: Simplify right side
    18,671.66x = 325,071,239.66
  5. Step 5: Solve for x
    x = 325,071,239.66/18,671.66
  6. Step 6: Final answer
    x = 17,409.87

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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.