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Finding the Fourth Proportional to 354.76, 531.78 and 172

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Solution

The fourth proportional to 354.76, 531.78 and 172 is: 257.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.76 : 531.78 = 172 : x
  2. Step 2: Convert to fraction form
    354.76/531.78 = 172/x
  3. Step 3: Cross multiply
    354.76x = 531.78 × 172
  4. Step 4: Simplify right side
    354.76x = 91,466.16
  5. Step 5: Solve for x
    x = 91,466.16/354.76
  6. Step 6: Final answer
    x = 257.83

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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.