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Finding the Fourth Proportional to 717.29, 989.02 and 665.45

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Solution

The fourth proportional to 717.29, 989.02 and 665.45 is: 917.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.29 : 989.02 = 665.45 : x
  2. Step 2: Convert to fraction form
    717.29/989.02 = 665.45/x
  3. Step 3: Cross multiply
    717.29x = 989.02 × 665.45
  4. Step 4: Simplify right side
    717.29x = 658,143.36
  5. Step 5: Solve for x
    x = 658,143.36/717.29
  6. Step 6: Final answer
    x = 917.54

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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.