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Finding the Fourth Proportional to 728.50, 1,005.52 and 448.78

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Solution

The fourth proportional to 728.50, 1,005.52 and 448.78 is: 619.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.50 : 1,005.52 = 448.78 : x
  2. Step 2: Convert to fraction form
    728.50/1,005.52 = 448.78/x
  3. Step 3: Cross multiply
    728.50x = 1,005.52 × 448.78
  4. Step 4: Simplify right side
    728.50x = 451,257.27
  5. Step 5: Solve for x
    x = 451,257.27/728.50
  6. Step 6: Final answer
    x = 619.43

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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.