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Finding the Fourth Proportional to 401.08, 551.41 and 398.58

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Solution

The fourth proportional to 401.08, 551.41 and 398.58 is: 547.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.08 : 551.41 = 398.58 : x
  2. Step 2: Convert to fraction form
    401.08/551.41 = 398.58/x
  3. Step 3: Cross multiply
    401.08x = 551.41 × 398.58
  4. Step 4: Simplify right side
    401.08x = 219,779.00
  5. Step 5: Solve for x
    x = 219,779.00/401.08
  6. Step 6: Final answer
    x = 547.97

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.