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Finding the Fourth Proportional to 2,126.79, 3,190.05 and 665.91

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Solution

The fourth proportional to 2,126.79, 3,190.05 and 665.91 is: 998.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,126.79 : 3,190.05 = 665.91 : x
  2. Step 2: Convert to fraction form
    2,126.79/3,190.05 = 665.91/x
  3. Step 3: Cross multiply
    2,126.79x = 3,190.05 × 665.91
  4. Step 4: Simplify right side
    2,126.79x = 2,124,286.20
  5. Step 5: Solve for x
    x = 2,124,286.20/2,126.79
  6. Step 6: Final answer
    x = 998.82

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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.