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Finding the Fourth Proportional to 312.90, 431.76 and 181.89

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Solution

The fourth proportional to 312.90, 431.76 and 181.89 is: 250.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.90 : 431.76 = 181.89 : x
  2. Step 2: Convert to fraction form
    312.90/431.76 = 181.89/x
  3. Step 3: Cross multiply
    312.90x = 431.76 × 181.89
  4. Step 4: Simplify right side
    312.90x = 78,532.83
  5. Step 5: Solve for x
    x = 78,532.83/312.90
  6. Step 6: Final answer
    x = 250.98

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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.