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Finding the Fourth Proportional to 2,086.51, 3,129.76 and 625.88

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Solution

The fourth proportional to 2,086.51, 3,129.76 and 625.88 is: 938.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,086.51 : 3,129.76 = 625.88 : x
  2. Step 2: Convert to fraction form
    2,086.51/3,129.76 = 625.88/x
  3. Step 3: Cross multiply
    2,086.51x = 3,129.76 × 625.88
  4. Step 4: Simplify right side
    2,086.51x = 1,958,838.54
  5. Step 5: Solve for x
    x = 1,958,838.54/2,086.51
  6. Step 6: Final answer
    x = 938.81

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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.