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Finding the Fourth Proportional to 2,127.80, 3,188.10 and 1,029.80

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Solution

The fourth proportional to 2,127.80, 3,188.10 and 1,029.80 is: 1,542.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,127.80 : 3,188.10 = 1,029.80 : x
  2. Step 2: Convert to fraction form
    2,127.80/3,188.10 = 1,029.80/x
  3. Step 3: Cross multiply
    2,127.80x = 3,188.10 × 1,029.80
  4. Step 4: Simplify right side
    2,127.80x = 3,283,105.38
  5. Step 5: Solve for x
    x = 3,283,105.38/2,127.80
  6. Step 6: Final answer
    x = 1,542.96

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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.