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Finding the Fourth Proportional to 816.38, 1,223.65 and 354.54

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Solution

The fourth proportional to 816.38, 1,223.65 and 354.54 is: 531.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.38 : 1,223.65 = 354.54 : x
  2. Step 2: Convert to fraction form
    816.38/1,223.65 = 354.54/x
  3. Step 3: Cross multiply
    816.38x = 1,223.65 × 354.54
  4. Step 4: Simplify right side
    816.38x = 433,832.87
  5. Step 5: Solve for x
    x = 433,832.87/816.38
  6. Step 6: Final answer
    x = 531.41

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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.