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Finding the Fourth Proportional to 717.10, 989.75 and 455.06

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Solution

The fourth proportional to 717.10, 989.75 and 455.06 is: 628.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.10 : 989.75 = 455.06 : x
  2. Step 2: Convert to fraction form
    717.10/989.75 = 455.06/x
  3. Step 3: Cross multiply
    717.10x = 989.75 × 455.06
  4. Step 4: Simplify right side
    717.10x = 450,399.25
  5. Step 5: Solve for x
    x = 450,399.25/717.10
  6. Step 6: Final answer
    x = 628.09

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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.