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Finding the Fourth Proportional to 528.12, 729 and 331.64

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Solution

The fourth proportional to 528.12, 729 and 331.64 is: 457.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.12 : 729 = 331.64 : x
  2. Step 2: Convert to fraction form
    528.12/729 = 331.64/x
  3. Step 3: Cross multiply
    528.12x = 729 × 331.64
  4. Step 4: Simplify right side
    528.12x = 241,761.92
  5. Step 5: Solve for x
    x = 241,761.92/528.12
  6. Step 6: Final answer
    x = 457.78

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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.