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Finding the Fourth Proportional to 401.04, 551.55 and 321.42

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Solution

The fourth proportional to 401.04, 551.55 and 321.42 is: 442.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.04 : 551.55 = 321.42 : x
  2. Step 2: Convert to fraction form
    401.04/551.55 = 321.42/x
  3. Step 3: Cross multiply
    401.04x = 551.55 × 321.42
  4. Step 4: Simplify right side
    401.04x = 177,279.20
  5. Step 5: Solve for x
    x = 177,279.20/401.04
  6. Step 6: Final answer
    x = 442.05

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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.