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Finding the Fourth Proportional to 403.74, 556.92 and 279.34

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Solution

The fourth proportional to 403.74, 556.92 and 279.34 is: 385.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.74 : 556.92 = 279.34 : x
  2. Step 2: Convert to fraction form
    403.74/556.92 = 279.34/x
  3. Step 3: Cross multiply
    403.74x = 556.92 × 279.34
  4. Step 4: Simplify right side
    403.74x = 155,570.03
  5. Step 5: Solve for x
    x = 155,570.03/403.74
  6. Step 6: Final answer
    x = 385.32

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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.