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Finding the Fourth Proportional to 727.92, 998.88 and 661.92

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Solution

The fourth proportional to 727.92, 998.88 and 661.92 is: 908.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.92 : 998.88 = 661.92 : x
  2. Step 2: Convert to fraction form
    727.92/998.88 = 661.92/x
  3. Step 3: Cross multiply
    727.92x = 998.88 × 661.92
  4. Step 4: Simplify right side
    727.92x = 661,178.65
  5. Step 5: Solve for x
    x = 661,178.65/727.92
  6. Step 6: Final answer
    x = 908.31

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.