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Finding the Fourth Proportional to 3,812.70, 5,721.47 and 1,621.43

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Solution

The fourth proportional to 3,812.70, 5,721.47 and 1,621.43 is: 2,433.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,812.70 : 5,721.47 = 1,621.43 : x
  2. Step 2: Convert to fraction form
    3,812.70/5,721.47 = 1,621.43/x
  3. Step 3: Cross multiply
    3,812.70x = 5,721.47 × 1,621.43
  4. Step 4: Simplify right side
    3,812.70x = 9,276,926.39
  5. Step 5: Solve for x
    x = 9,276,926.39/3,812.70
  6. Step 6: Final answer
    x = 2,433.16

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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.