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Finding the Fourth Proportional to 535.78, 739.19 and 311.61

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Solution

The fourth proportional to 535.78, 739.19 and 311.61 is: 429.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    535.78 : 739.19 = 311.61 : x
  2. Step 2: Convert to fraction form
    535.78/739.19 = 311.61/x
  3. Step 3: Cross multiply
    535.78x = 739.19 × 311.61
  4. Step 4: Simplify right side
    535.78x = 230,339.00
  5. Step 5: Solve for x
    x = 230,339.00/535.78
  6. Step 6: Final answer
    x = 429.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.