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Finding the Fourth Proportional to 667.72, 921.39 and 528.18

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Solution

The fourth proportional to 667.72, 921.39 and 528.18 is: 728.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.72 : 921.39 = 528.18 : x
  2. Step 2: Convert to fraction form
    667.72/921.39 = 528.18/x
  3. Step 3: Cross multiply
    667.72x = 921.39 × 528.18
  4. Step 4: Simplify right side
    667.72x = 486,661.56
  5. Step 5: Solve for x
    x = 486,661.56/667.72
  6. Step 6: Final answer
    x = 728.84

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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.