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Finding the Fourth Proportional to 1,065.05, 1,469.85 and 617

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Solution

The fourth proportional to 1,065.05, 1,469.85 and 617 is: 851.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,065.05 : 1,469.85 = 617 : x
  2. Step 2: Convert to fraction form
    1,065.05/1,469.85 = 617/x
  3. Step 3: Cross multiply
    1,065.05x = 1,469.85 × 617
  4. Step 4: Simplify right side
    1,065.05x = 906,897.45
  5. Step 5: Solve for x
    x = 906,897.45/1,065.05
  6. Step 6: Final answer
    x = 851.51

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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.