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Finding the Fourth Proportional to 401.30, 556.32 and 379.40

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Solution

The fourth proportional to 401.30, 556.32 and 379.40 is: 525.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.30 : 556.32 = 379.40 : x
  2. Step 2: Convert to fraction form
    401.30/556.32 = 379.40/x
  3. Step 3: Cross multiply
    401.30x = 556.32 × 379.40
  4. Step 4: Simplify right side
    401.30x = 211,067.81
  5. Step 5: Solve for x
    x = 211,067.81/401.30
  6. Step 6: Final answer
    x = 525.96

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.