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Finding the Fourth Proportional to 2,871.84, 3,960 and 1,938.72

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Solution

The fourth proportional to 2,871.84, 3,960 and 1,938.72 is: 2,673.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,871.84 : 3,960 = 1,938.72 : x
  2. Step 2: Convert to fraction form
    2,871.84/3,960 = 1,938.72/x
  3. Step 3: Cross multiply
    2,871.84x = 3,960 × 1,938.72
  4. Step 4: Simplify right side
    2,871.84x = 7,677,331.20
  5. Step 5: Solve for x
    x = 7,677,331.20/2,871.84
  6. Step 6: Final answer
    x = 2,673.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.