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Finding the Fourth Proportional to 728.51, 1,005.08 and 479.97

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Solution

The fourth proportional to 728.51, 1,005.08 and 479.97 is: 662.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.51 : 1,005.08 = 479.97 : x
  2. Step 2: Convert to fraction form
    728.51/1,005.08 = 479.97/x
  3. Step 3: Cross multiply
    728.51x = 1,005.08 × 479.97
  4. Step 4: Simplify right side
    728.51x = 482,405.85
  5. Step 5: Solve for x
    x = 482,405.85/728.51
  6. Step 6: Final answer
    x = 662.19

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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.