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Finding the Fourth Proportional to 718.21, 1,076.97 and 328.09

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Solution

The fourth proportional to 718.21, 1,076.97 and 328.09 is: 491.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.21 : 1,076.97 = 328.09 : x
  2. Step 2: Convert to fraction form
    718.21/1,076.97 = 328.09/x
  3. Step 3: Cross multiply
    718.21x = 1,076.97 × 328.09
  4. Step 4: Simplify right side
    718.21x = 353,345.80
  5. Step 5: Solve for x
    x = 353,345.80/718.21
  6. Step 6: Final answer
    x = 491.98

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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.