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Finding the Fourth Proportional to 422.30, 582.44 and 320.99

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Solution

The fourth proportional to 422.30, 582.44 and 320.99 is: 442.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.30 : 582.44 = 320.99 : x
  2. Step 2: Convert to fraction form
    422.30/582.44 = 320.99/x
  3. Step 3: Cross multiply
    422.30x = 582.44 × 320.99
  4. Step 4: Simplify right side
    422.30x = 186,952.90
  5. Step 5: Solve for x
    x = 186,952.90/422.30
  6. Step 6: Final answer
    x = 442.70

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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.