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Finding the Fourth Proportional to 403.36, 556.56 and 389.92

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Solution

The fourth proportional to 403.36, 556.56 and 389.92 is: 538.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.36 : 556.56 = 389.92 : x
  2. Step 2: Convert to fraction form
    403.36/556.56 = 389.92/x
  3. Step 3: Cross multiply
    403.36x = 556.56 × 389.92
  4. Step 4: Simplify right side
    403.36x = 217,013.88
  5. Step 5: Solve for x
    x = 217,013.88/403.36
  6. Step 6: Final answer
    x = 538.02

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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.