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Finding the Fourth Proportional to 716.68, 989.46 and 495.64

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Solution

The fourth proportional to 716.68, 989.46 and 495.64 is: 684.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.68 : 989.46 = 495.64 : x
  2. Step 2: Convert to fraction form
    716.68/989.46 = 495.64/x
  3. Step 3: Cross multiply
    716.68x = 989.46 × 495.64
  4. Step 4: Simplify right side
    716.68x = 490,415.95
  5. Step 5: Solve for x
    x = 490,415.95/716.68
  6. Step 6: Final answer
    x = 684.29

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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.