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Finding the Fourth Proportional to 531.86, 733.92 and 310.78

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Solution

The fourth proportional to 531.86, 733.92 and 310.78 is: 428.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    531.86 : 733.92 = 310.78 : x
  2. Step 2: Convert to fraction form
    531.86/733.92 = 310.78/x
  3. Step 3: Cross multiply
    531.86x = 733.92 × 310.78
  4. Step 4: Simplify right side
    531.86x = 228,087.66
  5. Step 5: Solve for x
    x = 228,087.66/531.86
  6. Step 6: Final answer
    x = 428.85

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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.