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Finding the Fourth Proportional to 312.98, 432.07 and 181.96

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Solution

The fourth proportional to 312.98, 432.07 and 181.96 is: 251.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.98 : 432.07 = 181.96 : x
  2. Step 2: Convert to fraction form
    312.98/432.07 = 181.96/x
  3. Step 3: Cross multiply
    312.98x = 432.07 × 181.96
  4. Step 4: Simplify right side
    312.98x = 78,620.35
  5. Step 5: Solve for x
    x = 78,620.35/312.98
  6. Step 6: Final answer
    x = 251.20

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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.