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Finding the Fourth Proportional to 718.62, 1,076.72 and 327.98

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Solution

The fourth proportional to 718.62, 1,076.72 and 327.98 is: 491.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.62 : 1,076.72 = 327.98 : x
  2. Step 2: Convert to fraction form
    718.62/1,076.72 = 327.98/x
  3. Step 3: Cross multiply
    718.62x = 1,076.72 × 327.98
  4. Step 4: Simplify right side
    718.62x = 353,142.63
  5. Step 5: Solve for x
    x = 353,142.63/718.62
  6. Step 6: Final answer
    x = 491.42

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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.