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Finding the Fourth Proportional to 743.40, 1,025.81 and 411.82

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Solution

The fourth proportional to 743.40, 1,025.81 and 411.82 is: 568.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.40 : 1,025.81 = 411.82 : x
  2. Step 2: Convert to fraction form
    743.40/1,025.81 = 411.82/x
  3. Step 3: Cross multiply
    743.40x = 1,025.81 × 411.82
  4. Step 4: Simplify right side
    743.40x = 422,447.54
  5. Step 5: Solve for x
    x = 422,447.54/743.40
  6. Step 6: Final answer
    x = 568.26

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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.