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Finding the Fourth Proportional to 997.71, 1,374.97 and 717.46

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Solution

The fourth proportional to 997.71, 1,374.97 and 717.46 is: 988.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.71 : 1,374.97 = 717.46 : x
  2. Step 2: Convert to fraction form
    997.71/1,374.97 = 717.46/x
  3. Step 3: Cross multiply
    997.71x = 1,374.97 × 717.46
  4. Step 4: Simplify right side
    997.71x = 986,485.98
  5. Step 5: Solve for x
    x = 986,485.98/997.71
  6. Step 6: Final answer
    x = 988.75

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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.