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Finding the Fourth Proportional to 2,643.80, 3,963.36 and 999.20

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Solution

The fourth proportional to 2,643.80, 3,963.36 and 999.20 is: 1,497.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,643.80 : 3,963.36 = 999.20 : x
  2. Step 2: Convert to fraction form
    2,643.80/3,963.36 = 999.20/x
  3. Step 3: Cross multiply
    2,643.80x = 3,963.36 × 999.20
  4. Step 4: Simplify right side
    2,643.80x = 3,960,199.22
  5. Step 5: Solve for x
    x = 3,960,199.22/2,643.80
  6. Step 6: Final answer
    x = 1,497.92

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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.