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Finding the Fourth Proportional to 716.32, 986.90 and 637.64

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Solution

The fourth proportional to 716.32, 986.90 and 637.64 is: 878.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.32 : 986.90 = 637.64 : x
  2. Step 2: Convert to fraction form
    716.32/986.90 = 637.64/x
  3. Step 3: Cross multiply
    716.32x = 986.90 × 637.64
  4. Step 4: Simplify right side
    716.32x = 629,286.92
  5. Step 5: Solve for x
    x = 629,286.92/716.32
  6. Step 6: Final answer
    x = 878.50

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1.5x scale

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.