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Finding the Fourth Proportional to 726.80, 998.20 and 672.80

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Solution

The fourth proportional to 726.80, 998.20 and 672.80 is: 924.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.80 : 998.20 = 672.80 : x
  2. Step 2: Convert to fraction form
    726.80/998.20 = 672.80/x
  3. Step 3: Cross multiply
    726.80x = 998.20 × 672.80
  4. Step 4: Simplify right side
    726.80x = 671,588.96
  5. Step 5: Solve for x
    x = 671,588.96/726.80
  6. Step 6: Final answer
    x = 924.04

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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.