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Finding the Fourth Proportional to 329.90, 455.92 and 247.28

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Solution

The fourth proportional to 329.90, 455.92 and 247.28 is: 341.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.90 : 455.92 = 247.28 : x
  2. Step 2: Convert to fraction form
    329.90/455.92 = 247.28/x
  3. Step 3: Cross multiply
    329.90x = 455.92 × 247.28
  4. Step 4: Simplify right side
    329.90x = 112,739.90
  5. Step 5: Solve for x
    x = 112,739.90/329.90
  6. Step 6: Final answer
    x = 341.74

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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.