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Finding the Fourth Proportional to 716.95, 989.40 and 422.20

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Solution

The fourth proportional to 716.95, 989.40 and 422.20 is: 582.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.95 : 989.40 = 422.20 : x
  2. Step 2: Convert to fraction form
    716.95/989.40 = 422.20/x
  3. Step 3: Cross multiply
    716.95x = 989.40 × 422.20
  4. Step 4: Simplify right side
    716.95x = 417,724.68
  5. Step 5: Solve for x
    x = 417,724.68/716.95
  6. Step 6: Final answer
    x = 582.64

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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.