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Finding the Fourth Proportional to 2,689, 4,030.62 and 1,128.61

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Solution

The fourth proportional to 2,689, 4,030.62 and 1,128.61 is: 1,691.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,689 : 4,030.62 = 1,128.61 : x
  2. Step 2: Convert to fraction form
    2,689/4,030.62 = 1,128.61/x
  3. Step 3: Cross multiply
    2,689x = 4,030.62 × 1,128.61
  4. Step 4: Simplify right side
    2,689x = 4,548,998.04
  5. Step 5: Solve for x
    x = 4,548,998.04/2,689
  6. Step 6: Final answer
    x = 1,691.71

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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.