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Finding the Fourth Proportional to 716.64, 990.84 and 634.56

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Solution

The fourth proportional to 716.64, 990.84 and 634.56 is: 877.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.64 : 990.84 = 634.56 : x
  2. Step 2: Convert to fraction form
    716.64/990.84 = 634.56/x
  3. Step 3: Cross multiply
    716.64x = 990.84 × 634.56
  4. Step 4: Simplify right side
    716.64x = 628,747.43
  5. Step 5: Solve for x
    x = 628,747.43/716.64
  6. Step 6: Final answer
    x = 877.35

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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.