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Finding the Fourth Proportional to 779.39, 1,169.22 and 317.49

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Solution

The fourth proportional to 779.39, 1,169.22 and 317.49 is: 476.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.39 : 1,169.22 = 317.49 : x
  2. Step 2: Convert to fraction form
    779.39/1,169.22 = 317.49/x
  3. Step 3: Cross multiply
    779.39x = 1,169.22 × 317.49
  4. Step 4: Simplify right side
    779.39x = 371,216.45
  5. Step 5: Solve for x
    x = 371,216.45/779.39
  6. Step 6: Final answer
    x = 476.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.