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Finding the Fourth Proportional to 729.43, 1,093.75 and 381.93

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Solution

The fourth proportional to 729.43, 1,093.75 and 381.93 is: 572.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.43 : 1,093.75 = 381.93 : x
  2. Step 2: Convert to fraction form
    729.43/1,093.75 = 381.93/x
  3. Step 3: Cross multiply
    729.43x = 1,093.75 × 381.93
  4. Step 4: Simplify right side
    729.43x = 417,730.88
  5. Step 5: Solve for x
    x = 417,730.88/729.43
  6. Step 6: Final answer
    x = 572.68

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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.