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Finding the Fourth Proportional to 717.85, 1,074.95 and 392.84

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Solution

The fourth proportional to 717.85, 1,074.95 and 392.84 is: 588.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.85 : 1,074.95 = 392.84 : x
  2. Step 2: Convert to fraction form
    717.85/1,074.95 = 392.84/x
  3. Step 3: Cross multiply
    717.85x = 1,074.95 × 392.84
  4. Step 4: Simplify right side
    717.85x = 422,283.36
  5. Step 5: Solve for x
    x = 422,283.36/717.85
  6. Step 6: Final answer
    x = 588.26

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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.