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Finding the Fourth Proportional to 717.09, 989.16 and 454.65

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Solution

The fourth proportional to 717.09, 989.16 and 454.65 is: 627.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.09 : 989.16 = 454.65 : x
  2. Step 2: Convert to fraction form
    717.09/989.16 = 454.65/x
  3. Step 3: Cross multiply
    717.09x = 989.16 × 454.65
  4. Step 4: Simplify right side
    717.09x = 449,721.59
  5. Step 5: Solve for x
    x = 449,721.59/717.09
  6. Step 6: Final answer
    x = 627.15

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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.