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Finding the Fourth Proportional to 821.26, 1,229.93 and 455.14

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Solution

The fourth proportional to 821.26, 1,229.93 and 455.14 is: 681.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.26 : 1,229.93 = 455.14 : x
  2. Step 2: Convert to fraction form
    821.26/1,229.93 = 455.14/x
  3. Step 3: Cross multiply
    821.26x = 1,229.93 × 455.14
  4. Step 4: Simplify right side
    821.26x = 559,790.34
  5. Step 5: Solve for x
    x = 559,790.34/821.26
  6. Step 6: Final answer
    x = 681.62

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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.