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Finding the Fourth Proportional to 2,661.84, 3,992.94 and 1,275.48

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Solution

The fourth proportional to 2,661.84, 3,992.94 and 1,275.48 is: 1,913.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,661.84 : 3,992.94 = 1,275.48 : x
  2. Step 2: Convert to fraction form
    2,661.84/3,992.94 = 1,275.48/x
  3. Step 3: Cross multiply
    2,661.84x = 3,992.94 × 1,275.48
  4. Step 4: Simplify right side
    2,661.84x = 5,092,915.11
  5. Step 5: Solve for x
    x = 5,092,915.11/2,661.84
  6. Step 6: Final answer
    x = 1,913.31

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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.