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Finding the Fourth Proportional to 717.45, 1,076.81 and 409.92

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Solution

The fourth proportional to 717.45, 1,076.81 and 409.92 is: 615.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.45 : 1,076.81 = 409.92 : x
  2. Step 2: Convert to fraction form
    717.45/1,076.81 = 409.92/x
  3. Step 3: Cross multiply
    717.45x = 1,076.81 × 409.92
  4. Step 4: Simplify right side
    717.45x = 441,403.91
  5. Step 5: Solve for x
    x = 441,403.91/717.45
  6. Step 6: Final answer
    x = 615.24

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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.