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Finding the Fourth Proportional to 667.98, 921.69 and 388.22

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Solution

The fourth proportional to 667.98, 921.69 and 388.22 is: 535.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.98 : 921.69 = 388.22 : x
  2. Step 2: Convert to fraction form
    667.98/921.69 = 388.22/x
  3. Step 3: Cross multiply
    667.98x = 921.69 × 388.22
  4. Step 4: Simplify right side
    667.98x = 357,813.88
  5. Step 5: Solve for x
    x = 357,813.88/667.98
  6. Step 6: Final answer
    x = 535.67

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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.