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Finding the Fourth Proportional to 340.76, 470.08 and 257.73

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Solution

The fourth proportional to 340.76, 470.08 and 257.73 is: 355.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.76 : 470.08 = 257.73 : x
  2. Step 2: Convert to fraction form
    340.76/470.08 = 257.73/x
  3. Step 3: Cross multiply
    340.76x = 470.08 × 257.73
  4. Step 4: Simplify right side
    340.76x = 121,153.72
  5. Step 5: Solve for x
    x = 121,153.72/340.76
  6. Step 6: Final answer
    x = 355.54

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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.