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Finding the Fourth Proportional to 728.25, 1,005.36 and 493.44

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Solution

The fourth proportional to 728.25, 1,005.36 and 493.44 is: 681.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.25 : 1,005.36 = 493.44 : x
  2. Step 2: Convert to fraction form
    728.25/1,005.36 = 493.44/x
  3. Step 3: Cross multiply
    728.25x = 1,005.36 × 493.44
  4. Step 4: Simplify right side
    728.25x = 496,087.65
  5. Step 5: Solve for x
    x = 496,087.65/728.25
  6. Step 6: Final answer
    x = 681.20

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1.5x scale

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.