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Finding the Fourth Proportional to 728.48, 1,091.43 and 636.95

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Solution

The fourth proportional to 728.48, 1,091.43 and 636.95 is: 954.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.48 : 1,091.43 = 636.95 : x
  2. Step 2: Convert to fraction form
    728.48/1,091.43 = 636.95/x
  3. Step 3: Cross multiply
    728.48x = 1,091.43 × 636.95
  4. Step 4: Simplify right side
    728.48x = 695,180.88
  5. Step 5: Solve for x
    x = 695,180.88/728.48
  6. Step 6: Final answer
    x = 954.30

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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.