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Finding the Fourth Proportional to 528.21, 729 and 331.72

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Solution

The fourth proportional to 528.21, 729 and 331.72 is: 457.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.21 : 729 = 331.72 : x
  2. Step 2: Convert to fraction form
    528.21/729 = 331.72/x
  3. Step 3: Cross multiply
    528.21x = 729 × 331.72
  4. Step 4: Simplify right side
    528.21x = 241,822.06
  5. Step 5: Solve for x
    x = 241,822.06/528.21
  6. Step 6: Final answer
    x = 457.81

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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.