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Finding the Fourth Proportional to 727.98, 1,004.78 and 479.33

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Solution

The fourth proportional to 727.98, 1,004.78 and 479.33 is: 661.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.98 : 1,004.78 = 479.33 : x
  2. Step 2: Convert to fraction form
    727.98/1,004.78 = 479.33/x
  3. Step 3: Cross multiply
    727.98x = 1,004.78 × 479.33
  4. Step 4: Simplify right side
    727.98x = 481,613.78
  5. Step 5: Solve for x
    x = 481,613.78/727.98
  6. Step 6: Final answer
    x = 661.58

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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.