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Finding the Fourth Proportional to 382.89, 527.91 and 312.88

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Solution

The fourth proportional to 382.89, 527.91 and 312.88 is: 431.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.89 : 527.91 = 312.88 : x
  2. Step 2: Convert to fraction form
    382.89/527.91 = 312.88/x
  3. Step 3: Cross multiply
    382.89x = 527.91 × 312.88
  4. Step 4: Simplify right side
    382.89x = 165,172.48
  5. Step 5: Solve for x
    x = 165,172.48/382.89
  6. Step 6: Final answer
    x = 431.38

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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.