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Finding the Fourth Proportional to 720.81, 994.84 and 422.01

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Solution

The fourth proportional to 720.81, 994.84 and 422.01 is: 582.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.81 : 994.84 = 422.01 : x
  2. Step 2: Convert to fraction form
    720.81/994.84 = 422.01/x
  3. Step 3: Cross multiply
    720.81x = 994.84 × 422.01
  4. Step 4: Simplify right side
    720.81x = 419,831.37
  5. Step 5: Solve for x
    x = 419,831.37/720.81
  6. Step 6: Final answer
    x = 582.44

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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.