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Finding the Fourth Proportional to 811.51, 1,215.99 and 445.18

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Solution

The fourth proportional to 811.51, 1,215.99 and 445.18 is: 667.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.51 : 1,215.99 = 445.18 : x
  2. Step 2: Convert to fraction form
    811.51/1,215.99 = 445.18/x
  3. Step 3: Cross multiply
    811.51x = 1,215.99 × 445.18
  4. Step 4: Simplify right side
    811.51x = 541,334.43
  5. Step 5: Solve for x
    x = 541,334.43/811.51
  6. Step 6: Final answer
    x = 667.07

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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.