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Finding the Fourth Proportional to 247, 340.86 and 155

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Solution

The fourth proportional to 247, 340.86 and 155 is: 213.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    247 : 340.86 = 155 : x
  2. Step 2: Convert to fraction form
    247/340.86 = 155/x
  3. Step 3: Cross multiply
    247x = 340.86 × 155
  4. Step 4: Simplify right side
    247x = 52,833.30
  5. Step 5: Solve for x
    x = 52,833.30/247
  6. Step 6: Final answer
    x = 213.90

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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.