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Finding the Fourth Proportional to 442.11, 664.14 and 279.93

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Solution

The fourth proportional to 442.11, 664.14 and 279.93 is: 420.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.11 : 664.14 = 279.93 : x
  2. Step 2: Convert to fraction form
    442.11/664.14 = 279.93/x
  3. Step 3: Cross multiply
    442.11x = 664.14 × 279.93
  4. Step 4: Simplify right side
    442.11x = 185,912.71
  5. Step 5: Solve for x
    x = 185,912.71/442.11
  6. Step 6: Final answer
    x = 420.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.