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Finding the Fourth Proportional to 723.23, 1,076.17 and 720.80

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Solution

The fourth proportional to 723.23, 1,076.17 and 720.80 is: 1,072.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.23 : 1,076.17 = 720.80 : x
  2. Step 2: Convert to fraction form
    723.23/1,076.17 = 720.80/x
  3. Step 3: Cross multiply
    723.23x = 1,076.17 × 720.80
  4. Step 4: Simplify right side
    723.23x = 775,703.34
  5. Step 5: Solve for x
    x = 775,703.34/723.23
  6. Step 6: Final answer
    x = 1,072.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.