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Finding the Fourth Proportional to 811.26, 1,214.28 and 445.14

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Solution

The fourth proportional to 811.26, 1,214.28 and 445.14 is: 666.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.26 : 1,214.28 = 445.14 : x
  2. Step 2: Convert to fraction form
    811.26/1,214.28 = 445.14/x
  3. Step 3: Cross multiply
    811.26x = 1,214.28 × 445.14
  4. Step 4: Simplify right side
    811.26x = 540,524.60
  5. Step 5: Solve for x
    x = 540,524.60/811.26
  6. Step 6: Final answer
    x = 666.28

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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.