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Finding the Fourth Proportional to 728, 1,005.12 and 479.52

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Solution

The fourth proportional to 728, 1,005.12 and 479.52 is: 662.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    728 : 1,005.12 = 479.52 : x
  2. Step 2: Convert to fraction form
    728/1,005.12 = 479.52/x
  3. Step 3: Cross multiply
    728x = 1,005.12 × 479.52
  4. Step 4: Simplify right side
    728x = 481,975.14
  5. Step 5: Solve for x
    x = 481,975.14/728
  6. Step 6: Final answer
    x = 662.05

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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.