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Finding the Fourth Proportional to 2,121, 3,179.88 and 659.28

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Solution

The fourth proportional to 2,121, 3,179.88 and 659.28 is: 988.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121 : 3,179.88 = 659.28 : x
  2. Step 2: Convert to fraction form
    2,121/3,179.88 = 659.28/x
  3. Step 3: Cross multiply
    2,121x = 3,179.88 × 659.28
  4. Step 4: Simplify right side
    2,121x = 2,096,431.29
  5. Step 5: Solve for x
    x = 2,096,431.29/2,121
  6. Step 6: Final answer
    x = 988.42

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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.