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Finding the Fourth Proportional to 779.99, 1,169.65 and 317.45

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Solution

The fourth proportional to 779.99, 1,169.65 and 317.45 is: 476.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.99 : 1,169.65 = 317.45 : x
  2. Step 2: Convert to fraction form
    779.99/1,169.65 = 317.45/x
  3. Step 3: Cross multiply
    779.99x = 1,169.65 × 317.45
  4. Step 4: Simplify right side
    779.99x = 371,305.87
  5. Step 5: Solve for x
    x = 371,305.87/779.99
  6. Step 6: Final answer
    x = 476.04

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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.