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Finding the Fourth Proportional to 528.50, 729.36 and 321.50

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Solution

The fourth proportional to 528.50, 729.36 and 321.50 is: 443.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.50 : 729.36 = 321.50 : x
  2. Step 2: Convert to fraction form
    528.50/729.36 = 321.50/x
  3. Step 3: Cross multiply
    528.50x = 729.36 × 321.50
  4. Step 4: Simplify right side
    528.50x = 234,489.24
  5. Step 5: Solve for x
    x = 234,489.24/528.50
  6. Step 6: Final answer
    x = 443.69

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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.