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Finding the Fourth Proportional to 442.53, 663.78 and 259.80

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Solution

The fourth proportional to 442.53, 663.78 and 259.80 is: 389.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.53 : 663.78 = 259.80 : x
  2. Step 2: Convert to fraction form
    442.53/663.78 = 259.80/x
  3. Step 3: Cross multiply
    442.53x = 663.78 × 259.80
  4. Step 4: Simplify right side
    442.53x = 172,450.04
  5. Step 5: Solve for x
    x = 172,450.04/442.53
  6. Step 6: Final answer
    x = 389.69

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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.