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Finding the Fourth Proportional to 2,086.35, 3,129.45 and 991.50

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Solution

The fourth proportional to 2,086.35, 3,129.45 and 991.50 is: 1,487.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,086.35 : 3,129.45 = 991.50 : x
  2. Step 2: Convert to fraction form
    2,086.35/3,129.45 = 991.50/x
  3. Step 3: Cross multiply
    2,086.35x = 3,129.45 × 991.50
  4. Step 4: Simplify right side
    2,086.35x = 3,102,849.68
  5. Step 5: Solve for x
    x = 3,102,849.68/2,086.35
  6. Step 6: Final answer
    x = 1,487.21

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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.