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Finding the Fourth Proportional to 716.64, 1,076.04 and 408.48

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Solution

The fourth proportional to 716.64, 1,076.04 and 408.48 is: 613.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.64 : 1,076.04 = 408.48 : x
  2. Step 2: Convert to fraction form
    716.64/1,076.04 = 408.48/x
  3. Step 3: Cross multiply
    716.64x = 1,076.04 × 408.48
  4. Step 4: Simplify right side
    716.64x = 439,540.82
  5. Step 5: Solve for x
    x = 439,540.82/716.64
  6. Step 6: Final answer
    x = 613.34

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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.