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Finding the Fourth Proportional to 312.84, 431.58 and 181.77

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Solution

The fourth proportional to 312.84, 431.58 and 181.77 is: 250.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.84 : 431.58 = 181.77 : x
  2. Step 2: Convert to fraction form
    312.84/431.58 = 181.77/x
  3. Step 3: Cross multiply
    312.84x = 431.58 × 181.77
  4. Step 4: Simplify right side
    312.84x = 78,448.30
  5. Step 5: Solve for x
    x = 78,448.30/312.84
  6. Step 6: Final answer
    x = 250.76

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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.