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Finding the Fourth Proportional to 712.75, 1,068.55 and 478.73

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Solution

The fourth proportional to 712.75, 1,068.55 and 478.73 is: 717.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.75 : 1,068.55 = 478.73 : x
  2. Step 2: Convert to fraction form
    712.75/1,068.55 = 478.73/x
  3. Step 3: Cross multiply
    712.75x = 1,068.55 × 478.73
  4. Step 4: Simplify right side
    712.75x = 511,546.94
  5. Step 5: Solve for x
    x = 511,546.94/712.75
  6. Step 6: Final answer
    x = 717.71

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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.