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Finding the Fourth Proportional to 743.09, 1,025.91 and 494.78

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Solution

The fourth proportional to 743.09, 1,025.91 and 494.78 is: 683.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.09 : 1,025.91 = 494.78 : x
  2. Step 2: Convert to fraction form
    743.09/1,025.91 = 494.78/x
  3. Step 3: Cross multiply
    743.09x = 1,025.91 × 494.78
  4. Step 4: Simplify right side
    743.09x = 507,594.62
  5. Step 5: Solve for x
    x = 507,594.62/743.09
  6. Step 6: Final answer
    x = 683.09

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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.