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Finding the Fourth Proportional to 2,429.26, 3,643.89 and 763.40

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Solution

The fourth proportional to 2,429.26, 3,643.89 and 763.40 is: 1,145.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,429.26 : 3,643.89 = 763.40 : x
  2. Step 2: Convert to fraction form
    2,429.26/3,643.89 = 763.40/x
  3. Step 3: Cross multiply
    2,429.26x = 3,643.89 × 763.40
  4. Step 4: Simplify right side
    2,429.26x = 2,781,745.63
  5. Step 5: Solve for x
    x = 2,781,745.63/2,429.26
  6. Step 6: Final answer
    x = 1,145.10

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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.