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Finding the Fourth Proportional to 2,138.76, 3,208.16 and 657.97

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Solution

The fourth proportional to 2,138.76, 3,208.16 and 657.97 is: 986.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.76 : 3,208.16 = 657.97 : x
  2. Step 2: Convert to fraction form
    2,138.76/3,208.16 = 657.97/x
  3. Step 3: Cross multiply
    2,138.76x = 3,208.16 × 657.97
  4. Step 4: Simplify right side
    2,138.76x = 2,110,862.96
  5. Step 5: Solve for x
    x = 2,110,862.96/2,138.76
  6. Step 6: Final answer
    x = 986.96

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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.