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Finding the Fourth Proportional to 714.96, 986.48 and 636.60

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Solution

The fourth proportional to 714.96, 986.48 and 636.60 is: 878.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.96 : 986.48 = 636.60 : x
  2. Step 2: Convert to fraction form
    714.96/986.48 = 636.60/x
  3. Step 3: Cross multiply
    714.96x = 986.48 × 636.60
  4. Step 4: Simplify right side
    714.96x = 627,993.17
  5. Step 5: Solve for x
    x = 627,993.17/714.96
  6. Step 6: Final answer
    x = 878.36

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.