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Finding the Fourth Proportional to 2,114.80, 3,171.92 and 634

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Solution

The fourth proportional to 2,114.80, 3,171.92 and 634 is: 950.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,114.80 : 3,171.92 = 634 : x
  2. Step 2: Convert to fraction form
    2,114.80/3,171.92 = 634/x
  3. Step 3: Cross multiply
    2,114.80x = 3,171.92 × 634
  4. Step 4: Simplify right side
    2,114.80x = 2,010,997.28
  5. Step 5: Solve for x
    x = 2,010,997.28/2,114.80
  6. Step 6: Final answer
    x = 950.92

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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.