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Finding the Fourth Proportional to 2,643.26, 3,965.25 and 912.02

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Solution

The fourth proportional to 2,643.26, 3,965.25 and 912.02 is: 1,368.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,643.26 : 3,965.25 = 912.02 : x
  2. Step 2: Convert to fraction form
    2,643.26/3,965.25 = 912.02/x
  3. Step 3: Cross multiply
    2,643.26x = 3,965.25 × 912.02
  4. Step 4: Simplify right side
    2,643.26x = 3,616,387.31
  5. Step 5: Solve for x
    x = 3,616,387.31/2,643.26
  6. Step 6: Final answer
    x = 1,368.15

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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.