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Finding the Fourth Proportional to 779.21, 1,169.25 and 317.31

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Solution

The fourth proportional to 779.21, 1,169.25 and 317.31 is: 476.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.21 : 1,169.25 = 317.31 : x
  2. Step 2: Convert to fraction form
    779.21/1,169.25 = 317.31/x
  3. Step 3: Cross multiply
    779.21x = 1,169.25 × 317.31
  4. Step 4: Simplify right side
    779.21x = 371,014.72
  5. Step 5: Solve for x
    x = 371,014.72/779.21
  6. Step 6: Final answer
    x = 476.14

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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.