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Finding the Fourth Proportional to 721.79, 1,081.26 and 375.35

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Solution

The fourth proportional to 721.79, 1,081.26 and 375.35 is: 562.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.79 : 1,081.26 = 375.35 : x
  2. Step 2: Convert to fraction form
    721.79/1,081.26 = 375.35/x
  3. Step 3: Cross multiply
    721.79x = 1,081.26 × 375.35
  4. Step 4: Simplify right side
    721.79x = 405,846.36
  5. Step 5: Solve for x
    x = 405,846.36/721.79
  6. Step 6: Final answer
    x = 562.28

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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.