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Finding the Fourth Proportional to 717.36, 1,074.92 and 486.36

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Solution

The fourth proportional to 717.36, 1,074.92 and 486.36 is: 728.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.36 : 1,074.92 = 486.36 : x
  2. Step 2: Convert to fraction form
    717.36/1,074.92 = 486.36/x
  3. Step 3: Cross multiply
    717.36x = 1,074.92 × 486.36
  4. Step 4: Simplify right side
    717.36x = 522,798.09
  5. Step 5: Solve for x
    x = 522,798.09/717.36
  6. Step 6: Final answer
    x = 728.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.