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Finding the Fourth Proportional to 667.28, 1,001.28 and 325.28

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Solution

The fourth proportional to 667.28, 1,001.28 and 325.28 is: 488.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.28 : 1,001.28 = 325.28 : x
  2. Step 2: Convert to fraction form
    667.28/1,001.28 = 325.28/x
  3. Step 3: Cross multiply
    667.28x = 1,001.28 × 325.28
  4. Step 4: Simplify right side
    667.28x = 325,696.36
  5. Step 5: Solve for x
    x = 325,696.36/667.28
  6. Step 6: Final answer
    x = 488.10

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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.