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Finding the Fourth Proportional to 442.76, 664.56 and 320.45

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Solution

The fourth proportional to 442.76, 664.56 and 320.45 is: 480.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.76 : 664.56 = 320.45 : x
  2. Step 2: Convert to fraction form
    442.76/664.56 = 320.45/x
  3. Step 3: Cross multiply
    442.76x = 664.56 × 320.45
  4. Step 4: Simplify right side
    442.76x = 212,954.93
  5. Step 5: Solve for x
    x = 212,954.93/442.76
  6. Step 6: Final answer
    x = 480.98

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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.