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Finding the Fourth Proportional to 716.79, 989.09 and 422.03

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Solution

The fourth proportional to 716.79, 989.09 and 422.03 is: 582.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.79 : 989.09 = 422.03 : x
  2. Step 2: Convert to fraction form
    716.79/989.09 = 422.03/x
  3. Step 3: Cross multiply
    716.79x = 989.09 × 422.03
  4. Step 4: Simplify right side
    716.79x = 417,421.76
  5. Step 5: Solve for x
    x = 417,421.76/716.79
  6. Step 6: Final answer
    x = 582.35

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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.