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Finding the Fourth Proportional to 2,085, 3,127.90 and 769.56

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Solution

The fourth proportional to 2,085, 3,127.90 and 769.56 is: 1,154.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,085 : 3,127.90 = 769.56 : x
  2. Step 2: Convert to fraction form
    2,085/3,127.90 = 769.56/x
  3. Step 3: Cross multiply
    2,085x = 3,127.90 × 769.56
  4. Step 4: Simplify right side
    2,085x = 2,407,106.72
  5. Step 5: Solve for x
    x = 2,407,106.72/2,085
  6. Step 6: Final answer
    x = 1,154.49

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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.