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Finding the Fourth Proportional to 717.81, 989.32 and 617.98

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Solution

The fourth proportional to 717.81, 989.32 and 617.98 is: 851.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.81 : 989.32 = 617.98 : x
  2. Step 2: Convert to fraction form
    717.81/989.32 = 617.98/x
  3. Step 3: Cross multiply
    717.81x = 989.32 × 617.98
  4. Step 4: Simplify right side
    717.81x = 611,375.96
  5. Step 5: Solve for x
    x = 611,375.96/717.81
  6. Step 6: Final answer
    x = 851.72

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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.