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Finding the Fourth Proportional to 3,786, 5,681.55 and 1,320.81

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Solution

The fourth proportional to 3,786, 5,681.55 and 1,320.81 is: 1,982.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,786 : 5,681.55 = 1,320.81 : x
  2. Step 2: Convert to fraction form
    3,786/5,681.55 = 1,320.81/x
  3. Step 3: Cross multiply
    3,786x = 5,681.55 × 1,320.81
  4. Step 4: Simplify right side
    3,786x = 7,504,248.06
  5. Step 5: Solve for x
    x = 7,504,248.06/3,786
  6. Step 6: Final answer
    x = 1,982.10

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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.