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Finding the Fourth Proportional to 720.61, 994.64 and 422.12

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Solution

The fourth proportional to 720.61, 994.64 and 422.12 is: 582.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.61 : 994.64 = 422.12 : x
  2. Step 2: Convert to fraction form
    720.61/994.64 = 422.12/x
  3. Step 3: Cross multiply
    720.61x = 994.64 × 422.12
  4. Step 4: Simplify right side
    720.61x = 419,857.81
  5. Step 5: Solve for x
    x = 419,857.81/720.61
  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.