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Finding the Fourth Proportional to 741.86, 1,023.09 and 636.91

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Solution

The fourth proportional to 741.86, 1,023.09 and 636.91 is: 878.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.86 : 1,023.09 = 636.91 : x
  2. Step 2: Convert to fraction form
    741.86/1,023.09 = 636.91/x
  3. Step 3: Cross multiply
    741.86x = 1,023.09 × 636.91
  4. Step 4: Simplify right side
    741.86x = 651,618.73
  5. Step 5: Solve for x
    x = 651,618.73/741.86
  6. Step 6: Final answer
    x = 878.36

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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.