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Finding the Fourth Proportional to 403.72, 556.92 and 272.80

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Solution

The fourth proportional to 403.72, 556.92 and 272.80 is: 376.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.72 : 556.92 = 272.80 : x
  2. Step 2: Convert to fraction form
    403.72/556.92 = 272.80/x
  3. Step 3: Cross multiply
    403.72x = 556.92 × 272.80
  4. Step 4: Simplify right side
    403.72x = 151,927.78
  5. Step 5: Solve for x
    x = 151,927.78/403.72
  6. Step 6: Final answer
    x = 376.32

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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.