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Finding the Fourth Proportional to 1,065.25, 1,469.91 and 617.11

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Solution

The fourth proportional to 1,065.25, 1,469.91 and 617.11 is: 851.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,065.25 : 1,469.91 = 617.11 : x
  2. Step 2: Convert to fraction form
    1,065.25/1,469.91 = 617.11/x
  3. Step 3: Cross multiply
    1,065.25x = 1,469.91 × 617.11
  4. Step 4: Simplify right side
    1,065.25x = 907,103.22
  5. Step 5: Solve for x
    x = 907,103.22/1,065.25
  6. Step 6: Final answer
    x = 851.54

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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.