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Finding the Fourth Proportional to 729.38, 1,092.90 and 555.80

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Solution

The fourth proportional to 729.38, 1,092.90 and 555.80 is: 832.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.38 : 1,092.90 = 555.80 : x
  2. Step 2: Convert to fraction form
    729.38/1,092.90 = 555.80/x
  3. Step 3: Cross multiply
    729.38x = 1,092.90 × 555.80
  4. Step 4: Simplify right side
    729.38x = 607,433.82
  5. Step 5: Solve for x
    x = 607,433.82/729.38
  6. Step 6: Final answer
    x = 832.81

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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.