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Finding the Fourth Proportional to 2,086.88, 3,129.71 and 625.68

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Solution

The fourth proportional to 2,086.88, 3,129.71 and 625.68 is: 938.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,086.88 : 3,129.71 = 625.68 : x
  2. Step 2: Convert to fraction form
    2,086.88/3,129.71 = 625.68/x
  3. Step 3: Cross multiply
    2,086.88x = 3,129.71 × 625.68
  4. Step 4: Simplify right side
    2,086.88x = 1,958,193.82
  5. Step 5: Solve for x
    x = 1,958,193.82/2,086.88
  6. Step 6: Final answer
    x = 938.34

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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.