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Finding the Fourth Proportional to 485.20, 727.92 and 341.20

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Solution

The fourth proportional to 485.20, 727.92 and 341.20 is: 511.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.20 : 727.92 = 341.20 : x
  2. Step 2: Convert to fraction form
    485.20/727.92 = 341.20/x
  3. Step 3: Cross multiply
    485.20x = 727.92 × 341.20
  4. Step 4: Simplify right side
    485.20x = 248,366.30
  5. Step 5: Solve for x
    x = 248,366.30/485.20
  6. Step 6: Final answer
    x = 511.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.