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Finding the Fourth Proportional to 407.20, 561.74 and 351.92

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Solution

The fourth proportional to 407.20, 561.74 and 351.92 is: 485.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.20 : 561.74 = 351.92 : x
  2. Step 2: Convert to fraction form
    407.20/561.74 = 351.92/x
  3. Step 3: Cross multiply
    407.20x = 561.74 × 351.92
  4. Step 4: Simplify right side
    407.20x = 197,687.54
  5. Step 5: Solve for x
    x = 197,687.54/407.20
  6. Step 6: Final answer
    x = 485.48

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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.