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Finding the Fourth Proportional to 455.02, 681.82 and 211.21

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Solution

The fourth proportional to 455.02, 681.82 and 211.21 is: 316.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.02 : 681.82 = 211.21 : x
  2. Step 2: Convert to fraction form
    455.02/681.82 = 211.21/x
  3. Step 3: Cross multiply
    455.02x = 681.82 × 211.21
  4. Step 4: Simplify right side
    455.02x = 144,004.97
  5. Step 5: Solve for x
    x = 144,004.97/455.02
  6. Step 6: Final answer
    x = 316.48

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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.