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Finding the Fourth Proportional to 667.26, 921.74 and 662.65

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Solution

The fourth proportional to 667.26, 921.74 and 662.65 is: 915.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.26 : 921.74 = 662.65 : x
  2. Step 2: Convert to fraction form
    667.26/921.74 = 662.65/x
  3. Step 3: Cross multiply
    667.26x = 921.74 × 662.65
  4. Step 4: Simplify right side
    667.26x = 610,785.39
  5. Step 5: Solve for x
    x = 610,785.39/667.26
  6. Step 6: Final answer
    x = 915.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.