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Finding the Fourth Proportional to 717.46, 1,076.44 and 392.66

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Solution

The fourth proportional to 717.46, 1,076.44 and 392.66 is: 589.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.46 : 1,076.44 = 392.66 : x
  2. Step 2: Convert to fraction form
    717.46/1,076.44 = 392.66/x
  3. Step 3: Cross multiply
    717.46x = 1,076.44 × 392.66
  4. Step 4: Simplify right side
    717.46x = 422,674.93
  5. Step 5: Solve for x
    x = 422,674.93/717.46
  6. Step 6: Final answer
    x = 589.13

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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.