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Finding the Fourth Proportional to 717.21, 989.69 and 455.22

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Solution

The fourth proportional to 717.21, 989.69 and 455.22 is: 628.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.21 : 989.69 = 455.22 : x
  2. Step 2: Convert to fraction form
    717.21/989.69 = 455.22/x
  3. Step 3: Cross multiply
    717.21x = 989.69 × 455.22
  4. Step 4: Simplify right side
    717.21x = 450,524.41
  5. Step 5: Solve for x
    x = 450,524.41/717.21
  6. Step 6: Final answer
    x = 628.16

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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.