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Finding the Fourth Proportional to 811.26, 1,216.13 and 317.99

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Solution

The fourth proportional to 811.26, 1,216.13 and 317.99 is: 476.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.26 : 1,216.13 = 317.99 : x
  2. Step 2: Convert to fraction form
    811.26/1,216.13 = 317.99/x
  3. Step 3: Cross multiply
    811.26x = 1,216.13 × 317.99
  4. Step 4: Simplify right side
    811.26x = 386,709.51
  5. Step 5: Solve for x
    x = 386,709.51/811.26
  6. Step 6: Final answer
    x = 476.68

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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.