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Finding the Fourth Proportional to 717.45, 989.36 and 660.95

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Solution

The fourth proportional to 717.45, 989.36 and 660.95 is: 911.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.45 : 989.36 = 660.95 : x
  2. Step 2: Convert to fraction form
    717.45/989.36 = 660.95/x
  3. Step 3: Cross multiply
    717.45x = 989.36 × 660.95
  4. Step 4: Simplify right side
    717.45x = 653,917.49
  5. Step 5: Solve for x
    x = 653,917.49/717.45
  6. Step 6: Final answer
    x = 911.45

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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.