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Finding the Fourth Proportional to 312.31, 430.96 and 181.32

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Solution

The fourth proportional to 312.31, 430.96 and 181.32 is: 250.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.31 : 430.96 = 181.32 : x
  2. Step 2: Convert to fraction form
    312.31/430.96 = 181.32/x
  3. Step 3: Cross multiply
    312.31x = 430.96 × 181.32
  4. Step 4: Simplify right side
    312.31x = 78,143.17
  5. Step 5: Solve for x
    x = 78,143.17/312.31
  6. Step 6: Final answer
    x = 250.21

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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.