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Finding the Fourth Proportional to 528.08, 729.20 and 439.52

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Solution

The fourth proportional to 528.08, 729.20 and 439.52 is: 606.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.08 : 729.20 = 439.52 : x
  2. Step 2: Convert to fraction form
    528.08/729.20 = 439.52/x
  3. Step 3: Cross multiply
    528.08x = 729.20 × 439.52
  4. Step 4: Simplify right side
    528.08x = 320,497.98
  5. Step 5: Solve for x
    x = 320,497.98/528.08
  6. Step 6: Final answer
    x = 606.91

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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.