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Finding the Fourth Proportional to 716.85, 989.21 and 422.21

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Solution

The fourth proportional to 716.85, 989.21 and 422.21 is: 582.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.85 : 989.21 = 422.21 : x
  2. Step 2: Convert to fraction form
    716.85/989.21 = 422.21/x
  3. Step 3: Cross multiply
    716.85x = 989.21 × 422.21
  4. Step 4: Simplify right side
    716.85x = 417,657.88
  5. Step 5: Solve for x
    x = 417,657.88/716.85
  6. Step 6: Final answer
    x = 582.63

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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.