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Finding the Fourth Proportional to 821.14, 1,231.88 and 455.16

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Solution

The fourth proportional to 821.14, 1,231.88 and 455.16 is: 682.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.14 : 1,231.88 = 455.16 : x
  2. Step 2: Convert to fraction form
    821.14/1,231.88 = 455.16/x
  3. Step 3: Cross multiply
    821.14x = 1,231.88 × 455.16
  4. Step 4: Simplify right side
    821.14x = 560,702.50
  5. Step 5: Solve for x
    x = 560,702.50/821.14
  6. Step 6: Final answer
    x = 682.83

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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.