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Finding the Fourth Proportional to 716.81, 989.06 and 421.97

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Solution

The fourth proportional to 716.81, 989.06 and 421.97 is: 582.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.81 : 989.06 = 421.97 : x
  2. Step 2: Convert to fraction form
    716.81/989.06 = 421.97/x
  3. Step 3: Cross multiply
    716.81x = 989.06 × 421.97
  4. Step 4: Simplify right side
    716.81x = 417,346.59
  5. Step 5: Solve for x
    x = 417,346.59/716.81
  6. Step 6: Final answer
    x = 582.23

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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.