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Finding the Fourth Proportional to 3,871.61, 5,809.47 and 1,681.88

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Solution

The fourth proportional to 3,871.61, 5,809.47 and 1,681.88 is: 2,523.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,871.61 : 5,809.47 = 1,681.88 : x
  2. Step 2: Convert to fraction form
    3,871.61/5,809.47 = 1,681.88/x
  3. Step 3: Cross multiply
    3,871.61x = 5,809.47 × 1,681.88
  4. Step 4: Simplify right side
    3,871.61x = 9,770,838.19
  5. Step 5: Solve for x
    x = 9,770,838.19/3,871.61
  6. Step 6: Final answer
    x = 2,523.71

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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.